Being moral is indistinguishable from being rational but nobody is perfectly rational

An issue in moral psychology is the extent to which moral judgments are the product of reason or of affective sentiments/

Hume's sensible knave knows what virtue requires but does not care, because he lacks the sentiment of benevolence that normally counteracts self interest. The sensible knave cannot be argued into morality but not because of any intellectual deficiency; he just does not feel the pull of morality at all.

Simply put, being moral is just indistinguishable from being rational.
yet nobody is perfectly rational

The Othello syndrome is about being driven mad by that green eyed monster, jealousy,
.