As Kahneman wrote, rationality is logical coherence, a rational person can believe in ghosts if the rest of their beliefs are consistent with ghosts. A rational

As Kahneman wrote, rationality is logical coherence, a rational person can believe in ghosts if the rest of their beliefs are consistent with ghosts. A rational person can prefer to be hated instead of loved, if it’s consistent. Most of the book is about economics and rational behavior in terms of utility, but that part seems to apply here as well. Logical coherence is always internal, it can only be complete within itself and will inevitably conflict with external reality and other internally coherent beliefs. It’s possible for a Nazi to be extremely rational in this way, whereas a reasonable person cannot be entirely rational by definition.