It's fecking unimaginable. Even actual criminals in organized crime groups or whatever generally wouldn't target innocent civilians ;let alone kids and they are actually conditioned to kill in cold blood. This type of a deranged human being used to come up once in a long long time in the form of a sick serial killer or something but to see it regularly is alarming just on the basis of multiple young aged individuals, regardless of whatever mental situation they are in, thinking doing this type of attack in particular is ok.
maybe people living over there can think of something specific. I mean, even actual terrorists are brainwashed and radicalized over ages and ages and then act usually in a politically motivated attack. Not someone who was living in a normal part of the country without that kind of influence doing this. (this is probably where I am missing something and they are indeed constantly influenced by such internal groups?)