“as far as waiting for a man to “act out”, by then that man will already be a priest, inside the system, and destroying young souls.”
Pre-admission screening and a teaspoon of vigilance in the seminaries should head that off at the pass.
Which is what I said, be very, very strict, even using instinct and gut feeling, which of course will eliminate a huge portion of the applicants, and you have to get the existing leadership and screeners to go along with those strict standards.