Sandusky made everyone victims. PSU, like the Catholic church, made the incorrect decision in not going to the authorities immediately. However they were still victims in this also in that Sandusky put them in a horrible position. To think that everyone knew about this scumbag is probably not correct. Hell I have not heard a single statement if his wife or family knew anything about it. These dirtbags do these things under the radar all the time. Dahmer, Gacey, BTK Killer got away with things for a long time and had people around them who never figured it out.
Joe and others at PSU got what they deserved by not acting on their knowledge. But it doesn't mean everyone knew about it and they probably didn't.