I totally understand the "Fry McQueary!" argument.
But...
1. If McQueary doesn't talk, this case is pretty weak. It's still really just one kid's word against Sandusky's. Nobody would ever know about the 2002 shower incident unless the kid that was raped comes forward. He still hasn't
2. By talking, McQueary took down the entire administration of Penn State and probably ruined his chances of coaching college football again.
I think he was fully aware of those two things.
You can call him a coward for not doing more back in 2002 and I'll agree, but what he did in the last couple of years took great courage.