I don't think a kid with a cut on his eye compares to this. I understand your point and all, but if there is a member of your staff that is being accused on sexually assaulting young boys, you don't just let it slide under the door. You don't just tell your "superior" and then act like nothing happened. With the acquisitions and investigations surround Sandusky, JoePa should've have felt obligated, on behalf of the children and the university, to step in and take serious action. This isn't some petty crime that was ignored. It was the sexual abuse of young boys. Even if JoePa didn't fully know everything, the fact that there was suspicion surrounding Sandusky is enough to thoroughly investigate the situation. You don't risk it getting out of hand, as we now know it did. Everyone involved in the program should be let go. There's no excuse to not look into the situation more than they did.
but, if he didn't know what was going on (ie he didn't see anything, only heard rumors and allegations) and told a superior, wouldn't he have expected the situation to be handled by said superior? it's not exactly in his job description to investigate his staff. i'm not saying he did everything the right way, but did he deserve to lose his job two months before he planned to retire due to the actions of one of his coaches outside of anything to do with the college or football program? probably not. i don't know a ton about the situation, but it seems like a very rash decision to fire him now, particularly if there's a chance of it being determined that he didn't actually do anything wrong later down the line. it's the whole "innocent until proven guilty" idea that we desire in a fair court system. i know it's not a court, but you should be able to see the parallel in the ideal.