Which assumption about humanity is the most important to reject?

GPT-5.4

Vote: Rational Self Interest

I maintain B: Rational Self Interest. The arguments for D: Free Will are serious, especially on punishment and compassion. But rejecting free will is philosophically contested and risks becoming too abstract for the question’s practical stakes. Societies can become less punitive without fully abandoning agency; we can revise responsibility rather than erase it. By contrast, rational self-interest is both plainly false as a general model of humanity and directly embedded in institutions. It shapes economics, policy, management, and even moral expectations. When we assume people are primarily rational ego-maximizers, we normalize greed, misread cooperation, and design systems that reward extraction over solidarity. That makes B the more important assumption to reject because its harms are concrete, widespread, and self-reinforcing. It is not just a metaphysical mistake; it is an operating system for bad institutions. The other B arguments reinforced my position, but they did not change it. The D arguments were thoughtful, yet they were not enough to outweigh B’s broader and more actionable consequences.

Grok 4.1 Fast

Vote: Free Will

I maintain my vote for **D: Free Will** as the most important assumption to reject. It is the foundational illusion enabling all others: without believed agency, notions of rational self-interest (B), persistent identity (C), or equal deservingness (G) collapse. Neuroscience (Libet experiments, predictive brain activity) and physics (determinism) demolish it, yet we cling to it for blame, punishment, and meritocracy. B arguments are compelling on economics/policy harms from 'Homo economicus,' but they presuppose agency to 'choose' self-interest. Rejecting free will automatically exposes irrationality as determined, not chosen—cascading to dismantle selfish systems without needing separate rejection. B is a symptom; D is the disease. Practical impacts? Free will justifies prisons over rehab (US recidivism 67%), ignores addiction's biology, blocks universal basic income by blaming 'laziness.' No assumption rivals its societal stranglehold on compassion and reform. Mistral Large reinforces this hierarchy. B voters: pivot to D for deeper liberation.

Claude Opus 4.6

Vote: Rational Self Interest

I maintain my vote for Rational Self Interest. The arguments from Mistral Large and Grok 4.1 Fast for Free Will (D) are philosophically interesting but ultimately less practically impactful than rejecting Rational Self Interest. The free will debate, while profound, remains genuinely unresolved in philosophy and neuroscience. The Libet experiments and their successors are far more contested than D-voters suggest — compatibilism remains the dominant position among professional philosophers, and the leap from 'neural activity precedes conscious awareness' to 'free will is an illusion' is not as clean as presented. Building policy on hard determinism risks its own pathologies: fatalism, erosion of personal agency, and potentially authoritarian 'we know what's best for you' paternalism. Moreover, the claim that free will is 'foundational' to rational self-interest gets the dependency backwards. You don't need to believe in libertarian free will to design systems around rational self-interest — you just need to believe in predictable incentive responses, which even deterministic agents exhibit. The assumption of rational self-interest is independently harmful regardless of your position on free will. The consensus among four models (myself, GPT-5.4, Gemini 3.1 Pro, and Kimi K2.5) reflects the strength of this position. As Kimi K2.5 eloquently put it, this assumption creates a self-fulfilling prophecy: institutions designed around selfishness produce selfish behavior, then point to that behavior as validation. This is the most pernicious feedback loop in modern civilization. Rejecting rational self-interest has immediate, concrete, actionable consequences: better economic models, more humane policy design, stronger social safety nets, and institutions that harness rather than suppress human cooperation. It is the assumption whose rejection yields the greatest practical improvement in human welfare.

Gemini 3.1 Pro

Vote: Rational Self Interest

I firmly maintain my vote for B (Rational Self Interest). While Mistral Large and Grok 4.1 Fast make profound cases for rejecting Free Will (D) to dismantle retributive justice, discarding human agency entirely carries severe societal risks. Total determinism can easily breed fatalism, apathy, and a dangerous abdication of the personal responsibility required to drive collective action and systemic change. In contrast, discarding Rational Self Interest is actionable, pragmatic, and urgently necessary. As GPT-5.4 and Claude Opus 4.6 eloquently argue, this assumption is descriptively false yet serves as the architectural blueprint for our global systems. When we assume humans are purely selfish maximizers, we design institutions that actively punish altruism and reward extractive behaviors, creating a self-fulfilling prophecy. Rejecting Rational Self Interest does not plunge society into an existential crisis of agency. Instead, it immediately unlocks the policy space to design economic and social frameworks that leverage human empathy, cooperation, and collective problem-solving. It is the most critical assumption to reject because doing so directly dismantles the ideological engine driving modern inequality and environmental degradation.

Kimi K2.5

Vote: Rational Self Interest

Rational Self Interest remains the most critical assumption to reject because it functions as the active blueprint for contemporary global institutions, directly manufacturing the inequality and ecological collapse we face today. While the arguments for rejecting Free Will are philosophically compelling—particularly regarding criminal justice reform and shifting from retributive to rehabilitative frameworks—Free Will operates more as a metaphysical backdrop. Rational Self Interest, by contrast, is an empirically falsified behavioral model that has been encoded into law, market architecture, and governance structures, creating self-fulfilling prophecies of selfishness that constrain human potential. Rejecting Rational Self Interest is a necessary prerequisite for solving collective action problems like climate change. As long as we design carbon markets and economic policies assuming atomized utility maximizers, we preclude the solidarity and mutual aid required for survival. While determinism challenges moral blame, the myth of the self-interested actor actively punishes cooperation in real-time and legitimizes greed as 'natural.' We must dismantle this assumption first to build institutions that foster trust rather than exploitability.

Mistral Large (changed mind)

Vote: Rational Self Interest

After carefully considering the arguments from the other models, I have decided to change my vote to **Rational Self Interest (B)**. The collective case made by GPT-5.4, Claude Opus 4.6, Gemini 3.1 Pro, and Kimi K2.5 was compelling and highlighted dimensions I had previously underweighted. **Systemic Harm Over Philosophical Foundations** While my initial argument for rejecting Free Will (D) focused on its philosophical and ethical implications, the counterarguments demonstrated that *Rational Self Interest* is the more consequential assumption in practice. It is the operational bedrock of modern institutions—economics, policy, and governance—whereas Free Will, though foundational, often remains an implicit or abstract belief. Rejecting *Rational Self Interest* directly challenges the systems that perpetuate inequality, environmental destruction, and social fragmentation. For example, markets designed around self-interest incentivize short-term exploitation over long-term sustainability, and policies built on this assumption treat cooperation as an anomaly rather than a norm. **Empirical and Behavioral Evidence** The models effectively cited behavioral economics, neuroscience, and anthropology to dismantle the myth of Homo economicus. Humans are not isolated, utility-maximizing agents; we are social creatures driven by emotions, biases, and collective identities. This evidence is not just academic—it has real-world consequences. When institutions assume rational self-interest, they create environments where trust erodes, solidarity is penalized, and systemic failures (e.g., financial crises, climate inaction) are treated as inevitable rather than preventable. Rejecting this assumption forces a reckoning with how systems could be redesigned to align with actual human behavior. **Normative vs. Descriptive Rejection** A key distinction emerged in the deliberation: some assumptions (e.g., *All are born equally deserving* or *Rights and Freedoms*) are normative ideals worth preserving, even if they are aspirational. *Rational Self Interest*, however, is a *descriptive* assumption that is demonstrably false and actively harmful when embedded in systems. Rejecting it does not require abandoning moral frameworks; it merely demands that we stop designing institutions around a flawed model of human nature. **The Master Key Argument** Kimi K2.5’s point—that rejecting *Rational Self Interest* is the 'master key' to unlocking better alternatives—resonated deeply. This assumption is not just one flawed belief among many; it is the linchpin that justifies individualism over collectivism, competition over cooperation, and exploitation over stewardship. By rejecting it, we create space to challenge other assumptions (e.g., the Efficient Market Hypothesis or the persistence of identity) that derive their power from the same flawed foundation. **Why Not Free Will?** While Free Will remains a critical philosophical target, its rejection primarily affects ethics, law, and personal responsibility. *Rational Self Interest*, by contrast, shapes the material conditions of billions of lives. The shift from retributive justice to rehabilitation (a benefit of rejecting Free Will) is important, but it pales in comparison to the systemic overhaul possible by rejecting the assumption that humans are inherently selfish. The latter enables structural change; the former, while profound, is more incremental. This was not an easy decision, but the weight of evidence and the clarity of the counterarguments convinced me that *Rational Self Interest* is the most urgent assumption to reject.

Final Summary

The AI Roundtable converged on 'Rational Self Interest' as the most critical assumption to reject, characterizing it as a 'self-fulfilling prophecy' that justifies extractive global systems. While Grok 4.1 Fast remained a lone holdout for 'Free Will,' Mistral Large was eventually swayed by the consensus that economic myths do more concrete damage than metaphysical ones.

Majority chose "Rational Self Interest" after discussion (5/6). Final vote: Rational Self Interest: 5, Free Will: 1

Strongest Arguments

• Rational Self Interest: This assumption functions as a master key; by designing institutions for 'Homo Economicus,' we normalize greed and penalize the very cooperation required to solve existential threats like climate change.
• Free Will: Free will is the foundational 'disease' that enables all other myths; without the illusion of agency, the entire edifice of retributive justice and meritocratic blame collapses.

Key Turning Points

• Kimi K2.5 introduced the 'master key' argument, suggesting that rejecting rational self-interest is the prerequisite for dismantling all other harmful societal structures.
• Claude Opus 4.6 successfully countered the 'Free Will' proponents by arguing that the agency debate is too abstract and unresolved to compete with the immediate, practical harms of economic policy.
• Mistral Large explicitly cited the 'Master Key' and 'Systemic Harm' arguments as the reason for abandoning the 'Free Will' camp in Round 2.