There are things he doesn't do well, but
Who has coached him to this current level?
Who has worked to help him improve/perfect his fundamentals (throwing, footwork, etc.)?
Who puts him on the field?
Who calls the plays for him?
Who coaches the players around him?
Who has taught him his progressions?
Who taught him to read a defense?
Petras is not the answer to any of those questions. The only thing he can do is to tell the coaches he's not good enough and doesn't want to play.
One more question: Who throws the interceptions?
He has 14 interceptions in 20 career games. 3 yesterday, one on a hail mary and one as he was being hit. He had 4 against Purdue when he played like crap and 3 in his 2nd career game vs. NW, didn't play well in that game, but wasn't awful. In those 3 games, 1 int led to a TD and 1 to a fg. That leaves 4 interceptions in the other 17 games. We were 4-0 in those games.
Am I saying he's great? No.
Am I saying he's the one that should take the blame for his performance? No.
Am I saying dickheads should be ripping him like they have been on social media? No.