Because, if the emails NBC is reporting about are true, there is solid proof that the leaders of your football program at the highest level (The University President, the V.P, and the Athletic Director) conspired not to report the rape of a child which occurred on your campus, in your football facilities, by a former member of the football staff and a current booster and fundraiser for the football program, who already had been under suspicion of pedophilia, to the police.
If the emails are true, they shielded a child rapist because they wanted to be "humane" to Sandusky, and obviously to keep the football program, and their own business partnerships with Sandusky, (like Paterno's lucrative bottled water business) from facing the light of public scrutiny. This conspiracy led to more children being raped.
You guys put those guys in charge of your program. They were placed in the most powerful positions, and abused that power. Your program is held responsible for the actions of its leadership and it's boosters. That's the way the NCAA is supposed to work.
Firing people after the fact, after you get caught red-handed, doesn't mean shit.