The traditional misperception of the brain as infinitely complex perpetuates unfounded credit towards it when rationalising behaviours. Participants compare their strategy in retrospect to that of mathematical capability of a computer. That is, the participant is not capable of mathematically computing rapidly enough an interception point, thus explaining their failure to live up to a clear predictive strategy. “If only we could realise the full potential of our brain.” Nonsense. The fallacy of the brain as the pinnacle of biological evolution, is used as a norm and blamed in an explanation of failure. It is thus perpetuated in every aspect of rationalising, but not for the observable behaviour. If you have a doctrine that constantly explains failure on the same terms, both a priori and a posteriori, there is good reason to examine it even closer. Observable behaviour is supposed to be the basis of assumption, indication and generalisation. I propose that traditional psychology does not. I propose it solely deals with antecedent assumptions and consequential rationalisation. Behaviour is only a means to the end of perpetuating the doubtful conclusions already postulated in the assumptions. There is a strong need for reinvention, to say the least.