You obviously don’t know much about the case. The investigation of Sandusky in 1998, and the disappearance of the DA in 2005 happened long before any of this became public knowledge.
This becoming public knowledge, whatever this is, is NOT the case. That Sandusky was investigated previously and the DA did not charge him was apparently public knowledge.
There will be two cases if this goes to trial. The state will present its case. The defense will present its case for defense. Then the trier[s] of fact will decide. So far you have only heard a small part of the governments version and they presume him guilty or they would not charge him.