Sandusky certainly didn’t behave as someone who was afraid of getting caught. He was raping boys in the locker room shower. He took them to say overnight with him in hotels on team outings. He was actually very open in his behavior which is why he was witnessed multiple times, however, he was never stopped.
He was witnessed twice. Both times the police were involved (the major failure being Schultz in 2002). Both times they failed to prosecute. He was most certainly NOT open about sexually abusing children. He was caught twice by chance. Read the report and see that he did these things late at night or when nobody was around.