Columnist Scott Ostler wrote a great column in the SF Chronicle last November that addresses your argument: Penn State's Joe Paterno gets what he deserves
Ostler wrote: Several e-mailers demand, "Have you ever heard of due process?" The due process I've heard of involves a justice system and a legal trial. Paterno faces no legal action or charge. Legally, his rear end is covered. But there was no trial when Paterno was sainted, no jury declared him one of the noblest and finest college coaches of all time. The public decided. It's the same deal on the flip side...
Other graphs from that Ostler column: What is the over-under number on how many people have to know about a depraved predator working under their noses before one of them takes a step to stop the predator and protect the victims? Jay Bilas, the ESPN college basketball commentator, called it "a conspiracy of cowards." ... With responsibility comes responsibility... "With the benefit of hindsight, I wish I had done more," Paterno said in a statement. That's pathetic. You need hindsight to tell you that you must do whatever you can to stop a dangerous criminal?
Why should he have done more? After all, there was no trial.