I'd rather we just kill him, keep his brain intact, and study it no differently than we do CTE patients so we can try and start finding ways to better identify these kinds of people early and stop future ones from happening, because studies are showing their brains are vastly different than normal on the few we've gotten to study.
The truly sad part is, a lot of these violent sexual criminals were also sexually assaulted or molested themselves. It doesn't warrant the behavior on any level, but it shows that it is a cycle that we can stop.
The simple answer? Because it doesn't involve a legendary figure like Paterno. The people who knew or should have known were admin folks, who are powerful people but unknown to the general public.
Remember at one point in that story the media tried to tie Izzo and Dantonio into it somehow, speculating or trying to infer that they knew, but got pushback because that seemed like a reach. If either or both of those guys knew, then it would get Penn St-type coverage.