Consider the sunk cost issue. Suppose that you spent years working on a project that is heading nowhere, the effort was wasted, and there's a logical way to see that it is wasted effort. Any time your thought wavers in the direction of understanding that the effort was wasted, you get stab of negative emotions - particular hormones are released into bloodstream, particular pathways activate - and that is negative reinforcement for everything you've been doing including the use of mental framework that did lead you to that thought.

Solution: have a community where you can gain respect and status by having successfully noticed and avoided sunk cost reasoning. LW isn`t the best possible example of such a community, but a lot of the exercises done at, say, the summer minicamps in San Francisco were subsets of "get positive reinforcement for noticing Irrational Thought Pattern X in yourself, when normally various kinds of cognitive dissonance would make it tempting to sort of vaguely not notice it."