I haven't worked through all the "predator priests" in the PA report, but a quick survey shows many of the perpetrators were ordained before VII, and others ordained after VII were sufficiently close in time that they had to have gotten their seminary formation prior to VII.
Mind you, all the priests ordained from the time of Pope St. Pius X at least through Pope Pius XII were to have taken the Oath Against Modernism.
Modernism is the synthesis of all heresies, per Pope St. Pius X!
A participant in V2 stated after the council, “Modernism has triumphed”.
What does that suggest about the root of the tree bearing such rotten fruit?