Good point, and here is what I think is at play here:
I don't believe that officiating is any worse now than it has been in the past, and I don't believe that players are dirtier now than they have been in the past.
What has changed in recent years is the awareness of head injuries by the league, players, and the fans, the hyper-scrutiny on each borderline hit by pundits, fans, and anyone else with an opinion, and the league trying to cut all this off at the head by doling out more suspensions and being, eh hem, more "transparent" with their reasoning.
With the league tweaking the rules to enhance players safety, and trying to crack down on illegal hits, they have changed the perception we have while watching the game, and in part, have helped to cause some frustration amongst fans. Because, while the officiating is perhaps no less consistent than it has always been, it does seem inconsistent when viewed through the critical lens the league itself has created.
What is happening on the ice and off the ice, does not always seem to match up, and that is frustrating. Furthermore, it seems like the league does not always follow its own rules when doling out punishment. So is it about player safety or is it only sometimes about that? Is it about what a player did on the ice, or is it about that players "star" status, which team he is on, etc.? Maybe this bias doesn't really exist, but it's hard not to scratch your head over some of the decisions and non-decisions that have taken place, Bruins and otherwise.
Once again, part of this is the league itself setting a standard that it then does not itself meet, for various reasons. With all of the media and fan scrutiny paid to each game and each hit, the method for doling out discipline has to be above reproach or else it leads to a bleep storm time and time again, when everyone starts questioning and comparing each hit/suspension. The league has screwed itself by setting a standard and then not living up to it. They have shifted the perception/expectations about the awareness and punishment that comes with these hits, but have then refused to then establish a meaningful and consistent mode of discipline.