"Shitty people exist everywhere. You don't have the counterfactual to know if those bosses would be even worse without an MBA"

Not at all what I was saying, but since you brought it up: MBA or not, I'd expect the outcome of someone with zero real-world experience being elevated to a position of making executive decisions would be universally shite.

Yes, it's entirely to do with HR processes, but nonetheless the reason MBA programs exist at all is because they offer students the outcomes that they do - outcomes that are entirely unwarranted based on any evidence that currently exists.