How do you trust the new mind any more than the old mind? What makes you (or anyone) think that you are wired any differently than before... rather than that you just chose different things to put your faith into?
Taking something someone else said as fact, without fully investigating it on your own is not a good idea, I agree. Its a pretty good way to be fooled. But a lot of people investigate and question and still arrive at different conclusions. What makes one right over another?
Well, nothing, imo. Unless a person has some inside knowledge, the rest of us are just doing the best we can... but most of us are just guessing, just with different sources of information, and placing different levels of validity on the sources we do draw upon and question.
We all live in glass houses, and none of us should be throwing stones.