Morality Depends on Rationality, Right?

Our legal system is also based on the idea that people are fundamentally reasonable, reliably rational. But if that's not the case, can we hold people responsible for their actions? I mean, the way they're connecting evidence to belief to action is seriously, you know, problematic. And so this idea that we've carried throughout all of our history from Aristotle on that human beings are the rational animals that's ultimately flawed or not.