I don't see the big deal. Yes, it was a helmet to helmet. But Rapp leads with his shoulder, and the hit happens because contact was already made.
If the route isn't undercut, or the ball is placed perfectly, or if Adams makes an unbelievable catch and Rapp didnt come screaming over on the other side of the field... we have seen this D give up touchdowns like that and the board melts down.
It was a penalty. It was called as such. If Adams is so upset then he should ask his coach why he was being wheeled out in garbage time.