it is very interesting that the NFL's rules with protecting players from viscous hits started essentially due to Pittsburgh Steelers:
1. the Mel Blount Rule - most might not know of former Steelers corner Mel Blount, but he is perhaps one of the greatest corners to ever play the game. the Mel Blount Rule was reinstated in the late 70s because Blount was known to physically harass wide receiver's with his "bump and run" technique. he would physically overpower the WRs at the line of scrimmage (the bump) and then follow them closely down the field (the run). because of this, the NFL made it only legal for the defensive players to contact the receivers during the first 5 yards.
2. the Hines Ward Rule - due to Hines Ward ending a couple of defense backs' seasons, this rule was created in 2009. Hines Ward made a habit of striking fear in the heart of defenders by viciously blocking them when they weren't paying attention, but still running towards the play. now it is illegal for a player to blindside another with their helmet, forearms, or shoulders. so what can you use then to block??
3. the James Harrison Rule - James Harrison has said that he tries to hurt his opposing offensive players, yet he doesn't try to injure them. due to the malicious style of Harrison's (mostly legal) hits, and due to him sidelining two of the Cleveland Browns last weekend, the NFL has instigated a policy against cringe-worthy tackles.
thanks to Commissioner Goodell the NFL is taking baby steps away from being the game that longtime fans love to watch

I say let them play football god dammit, they are being paid more than enough and they know the risks due to the violent nature of the game