Twin study suggests rationality and intelligence share the same genetic roots - the study suggests that being irrational, or making illogical choices, might simply be another way of measuring lower intelligence.

[u/mvea]

https://www.psypost.org/twin-study-suggests-rationality-and-intelligence-share-the-same-genetic-roots/

[u/Frosti11icus]

Most decisions are rational from the perspective of the person making them. Calling a decision irrational is more of a privilege of an outside observer. There’s too many variables involved for outsiders to make that call. Making correct Vulcan like decisions requires that your story be written in such a way that you can make correct Vulcan like decisions, but most people don’t get that life.