I have no opinion whatsoever on your son's subjective state with God.

Objectively his second marriage appears to be invalid, if for no other reason then it was done outside the Church altogether. He appears to have an admirable character to not join his father in ranting at the Church.

Your allegation about the bishops is simply more of the unsupported "if you don't do it my way and/or see it my way, you're ....". As far I have been able to determine the errors were made in good faith, in particular that there were "cures" available for certain strong tendencies.

Neither the civil authority nor the Church can substitute your nebulous sentimentality and by-the-seat-of-the-pants approach to law and order, or right and wrong.

"I'll know it when I see it" doesn't work as a rule in either milieu.