The only problem I got with it is when they get it wrong.
I don't understand how "everyone" bought the horse collar thing so easily. You rarely hear any complaints unless it's erroneously called against your team.
The NFL is not saying you can't hit a receiver. Or that you can't run through a defender. Just don't hit the receiver in the head, just don't lower your head to hit a defender.... The game is still just as violent.
Like 'cak said, bigger faster stronger.