That hit by Xhekaj was pure frustration on his part. It doesn't belong in the game, but after watching three important players on the Habs get long term injuries from dirty hits, I think he wanted to really send a message to the Sens bench and the rest of the league that you're playing with fire if you take runs at Habs players. Stupid and hotheaded move, but I at least understand why he was so pissed off.
That old-school hockey justice is coming back because the DOPS is mostly toothless, and their punishments are halfhearted at best. I don't know what they can really do to Paré, because he's not likely to ever play an NHL game anyway, but in general they need to be harsher on that, because otherwise guys like Xhekaj are going to start taking steps on their own. The whole point of having a league discipline office was to make that kind of bullshit obsolete.