I think I would guess "MOST OF THEM." I think we have holy and chaste bishops in America. But I don't think there are more than a few. My biggest worry over this is how many of them are going to lie, dissemble, backtrack, obfuscate, mumble, and lie some more. The fooey is going to hit the fan soon. I am sure that even if most of these bishops are not actually GUILTY of the sins of pederatsy and abuse, 99% of them have covered for a priest (or another bishop) who IS guilty. This isn't just a can of worms: It's the whole bait shop.
If the bishops say, as I think they will, that Canon Law dictated much of what they did, will that surprise you?
The Vatican, through a couple of mouthpieces, is still saying that documents don't have to be turned over to civil authorities, and that parishioners don't have to be told that the "new priest" is a perv, lest his reputation be sullied.
The density goes all the way to Rome.
The problem with the clergy and bishops in America is that even most of the holy, chaste individuals are very weak leaders. Afraid to make waves and too compassionate to the wrong people.
Celibacy has nothing to do with this weakness, by the way.