A lot of people here are forgetting that you can tackle with your shoulder.
That sack was going to happen one way or another. Hardy had plenty of time to use better judgement. Look what happened after the sack. Palmer had to leave the game. This is the exact situation that led to the creation of the rule, guys. This is a textbook penalty and he was right to get fined. The goal should be to get a sack, not to injure the quarterback. What Hardy did was a cheap shot. I would have been a lot happier with a clean sack.
It would have taken a split second longer to reach him with his shoulder than his facemask and that split second could have been the difference between a successful offensive play and a failed one. The sack wasn't going to happen one way or the other, in fact IT DIDN'T EVEN HAPPEN. It was an incomplete pass. So seeing as how he was already a split second late, he obviously didn't have time to go out of his way to be as gentle and considerate as possible. His goal didn't seem to be to injure at all, his goal seemed to be to take the QB down as quickly as possible. It was a textbook something alright, a textbook tackle. Face up, drive through (not launching), between the knees and shoulder pads.