The idea that we ought to believe what's true is itself a normative picture of how humans should think rather than a descriptive picture of how humans do think.

The idea that we ought to believe what's true is itself a normative picture of how humans should think rather than a descriptive picture of how humans do think. There's no scientific way around underdetermination, but there certainly are a number of philosophical ways around it. Starting with: I'll believe whatever the heck I want to believe. https://en.wikipedia.org/wiki/Underdetermination https://en.wikipedia.org/wiki/Underdetermination