Yes, because bullying and shitty human behavior and mental health crises happen everywhere.
The big difference to take away from this incident is that this shooter had a handgun and there were "only" (still a fucking horror) a few people shot, vs in America where the shooter has body armor and assault rifles and dozens of people get shot.
I think the key factor here is that the shooter was 12 and incompetent. They're inferior to rifles but you can still kill a bunch of people with a handgun.
I'm not about to blame a 12 year old for their actions. Life as a bullied kid can really, really suck. Depression and suicide are common effects of bullying, and as a kid you just don't have the knowledge of how to deal with it.
If you bully / mentally abuse somebody to the point that they commit suicide, my opinion is that you are just as culpable as if you had murdered them yourself. By that standard, I don't see much difference if the victim decides to lash out and take their bully with them. Especially if you're a kid with no long term perspective. If you're in that situation as a kid, you're a victim and the system has failed you.