There's reckless, there's dirty, and then there's totally lost your marbles. Guess which category I'd put Kassian in?
Which category do you think the highly respected (2009 and 2019 Norris winners and highly respected long before that) Chara and Giordano belong in?
Yes... some fans do have blind spots when it comes to certain players on their own teams (although that certainly doesn't seem to hold true in most cases when players are discussed on the team's home board - if you want to see players get torn apart... that's usually the place to read it) but to try to downplay the seriousness of an action so reviled in the hockey world is just ridiculous (not accusing you of doing this... you're not) and just goes to further reinforce what people think of another fan base (even though the offending parties are generally in the miniscule minority).
Kudos to fans calling out their brother fans when they are being ridiculous and are just plain wrong.
As for your comment about the refs... I'd like the linesmen to be given the power to call all penalties whether they be major or minor. Its ridiculous that the linesman, who was right there when it happened, wasn't able to call that a penalty. Give the refs the ability to overrule the linesman, but at least give the linesman that ability to put his arm up and make the initial call at the time. Stuff just happens too fast in today's game for two refs to see everything. Plus its more difficult to "manage" a game when you have 4 people calling penalties instead of 2.