Having watched the video (and enjoyed the gory close-up) of Bruins' defense Chara spreading Montreal's Pacioretty into the center stanchion. Pacioretty lost consciousness due to the play and has damaged at least one vertebra.
Personally I agree with the on- and off-ice calls of this play -- it was a late hit on a player who had already chipped on the puck. That's text book interference, and that's what Chara served two minutes for.
The howls from the Montreal fan base can be ignored as partisan ignorance. With the way the random Wheel Of Discipline spins in the NHL, it was quite possible that this might have been seriously punished; the media loves to get out in front of these things so they can fill the moments until the next game with "I told you so" type comments.
The League's result of the Wheel Of Discipline is actually the right call. This was an unfortunate injury from a play, which while being "against the rules", was not worthy of further punishment.
This is not the kind of "violence" that the NHL needs to get rid of. The dangerous hits blindsiding players (such as claimed Spezza earlier this year) and the hits to the head (such as has claimed Crosby's year) have to go.
And the fighting has to go to, but for me that's an old saw.
I'm no fan of violence in hockey, but I don't think this incident is really worthy of the coverage it is getting.