Thing is, kids played as comboys even without video-games. pretend shooting always existed and always will exist.
Videogames just do the pretend shooting better but it's just clearly a game. You don't play Battlefield because you like to shoot people. You do it because it's a competition and you get points. The fact that there's blood isn't the reason most people play it. It's just a game and it's no different than playing with plastic swords or plastic guns. Violence isn't the point.
A game like this is just replacing human contact. The whole point of this is to act the fantasy of talking with someone when you could actually go talk to someone in real life. You could actually live the game you are playing.
People play this to act a fantasy and, with VR, it's easier and easier to live on that fantasy instead of the real world.
Most concerns have nothing to do with this being a school girl but more with the fact that VR might be something detrimental to the way humans contact with each other.
TL
R People play Battlifield for it's mechanics not to pretend to kill people while people play this kind of stuff as a fantasy and with VR a way to replace something they could have in real life.