Actually I read about that, and I thought that the person who shot him was a young man that went to confront him about the priest having abused him in the past. He wanted the priest to apologize to him for the abuse. According to the reports I read, the priest laughed at him and told him he wouldn't apologize, and that's what set the young man off ...
Not that it's right to shoot him in return, but if the priest was really molesting him as a child and then put him down when he came asking for closure, that's pretty mean ...