I take an even more sour view of this thought process. I don't actually think that SBF did the math and concluded that rationality justified his crimes. I think that he wanted to do those crimes and then, consciously or unconsciously, spread the veneer of rationality over them as a form of self-justification.

I think that a community that engages in brute math with unbounded values for priors to justify action would be worrisome. By choosing the right priors you can conclude almost anything. But I actually think that it is just roughly the same decision making that the rest of the world makes, with an unusual post-facto justification that also feeds one's ego.