This is a good point. Though the thing about true beliefs is that there is a specific version of them that’s true, which you’re allowed to defend (if you can find it). And so you can more easily figure out what the implications are.
Whereas for false beliefs you can’t get into the specifics, because looking hard enough at the specifics will tend to disprove the belief.
I don’t see why it should be limited to false beliefs.
Note that even if X is true, X->Y need not be true, and it can still be harmful to not be able to question X->Y.
This is a good point. Though the thing about true beliefs is that there is a specific version of them that’s true, which you’re allowed to defend (if you can find it). And so you can more easily figure out what the implications are.
Whereas for false beliefs you can’t get into the specifics, because looking hard enough at the specifics will tend to disprove the belief.