From the Grand Jury Report:
"Paterno called Tim Curley ("Curley"), Penn State Athletic Director and Paterno's immediate superior, to his home the very next day, a Sunday, and reported to him that the graduate assistant had seen Jerry Sandusky in the Lasch Building showers fondling or doing something of a sexual nature to a young boy." Was Paterno a direct witness? No. Did he have, "no idea"? I don't see how anybody could make that claim with a straight face.
The point is that many people (I don’t know if this includes you, but I suspect it does) read the report and then assume that Paterno knew exactly what Sandusky had done and had been doing all along. The facts support that he had no idea until 2002, at which point he knew that his graduate assistant had seen something. Paterno has said repeatedly that what was told to him was not explicit or detailed, which explains why he would still not be certain what Sandusky was doing.
Facts are unimportant to these people, they are defenders of the evil.