There is no absolute rational being out there to guide us however.

Certainly everyone makes irrational decisions, from this or that perspective. Everybody judge by the light of the scope their mind can handle at the moment they have to. When situation is that one got education integrating many tools of rationalization and all the idle time to practice it in stable virtually riskless social position, they most likely will do that. When one lakes sophisticated conceptual tools, time or budget or network to apply them, then they most likely won't bet on the long time most beneficial outcome after considering everything that rationality can ingurgite.