The influence of unacceptable mistakes explains why some decisions are irrational despite maximizing utility with respect to current circumstances and options actually considered. It explains why dilemmas of rational decision exist and why self-justifying non-optimal decisions donot exist. Correction for unacceptable mistakes is an important factor in an explanation of a decision’s comprehensive rationality. It does not lead to one-boxing in Newcomb’s problem or to deliberations and plans with irrational steps but does lead to possibilist versions of utilitarianism.
Keywords: acceptable mistake, comprehensive rationality, consideration of options, deliberation, dilemma of rationality, Newcomb's problem, plan, utilitarianism,