I could think of probably a dozen legitimate contexts for that email right off the top of my head. And in a trial is where those contexts would be brought to the surface. Nobody would incriminate someone on that email alone. Not even if it was Joe Schmo or Joe Cool.
But we aren't discussing legality here. Why was Paterno even being kept apprised of what was going on in the first place? He had met his legal obligation and many argue that, under PA law, he couldn't be kept involved after reporting it. Just one big circle argument.
Whatever. He is a disgrace in every circle that doesn't contain delusional Penn State fans holding on to something that was never existed and was completely fraudulent. He just didn't give a shet any longer and couldn't be bothered by it.