They aren't mutually exclusive. More than one thing can be true.
It was a horrible call.
Vegas absolutely gagged.
You don't need to discount one thing in support of the other.
It was a pretty normal for a bad call if you watch it live.
First of all, it's a "normal" play in a sense but when you're already falling to the ice after contact with guy #1 and a second guy plants you into the ice when your balance is already compromised that's dangerous as ****. I've seen plenty of injuries after similar plays where a guy is already tripping or headed down then a second guy makes contact on him while he's falling....zero chance to protect yourself from a bad fall. Go back and watch it, Pavelski was going to the ground before the second cross check.
No, it wasn't a 5 minute major according to the rule book but damn....that is a dangerous play to make as you've no chance to protect yourself from the second check after you're already falling backwards.
Then the blood/injury, etc, and it's 10 minutes while the other teams is up 3 goals? Not worth the argument it's getting.
In the days before no-touch icing you saw this all the time until the rules were changed. Guys would run toe to toe to the boards and one would fall while not even being touched, lay on the ice injured...5 minute major. Then, another play where a fella plants the dude in the numbers 10 feet before the boards and the refs would swallow the whistle thinking the guy fell and it was an accident.
Again, even as far as bad calls go it was far from the worst and was not THE pivotal factor in a 3-0 10 minute game...unless you believe ****ting the bed was warranted on the Knights part.