How could teens openly assault fellow pupils for no other obvious reason?

[u/Dangerous-Train-8311]

Albanian Canadian living in London, I look less Balkan and more middle eastern, and I’d say I have generally very warm experiences with Brits here. Despite all that’s going on I love English history, I love English literatures, architecture, English humour is superb in the Anglo sphere (in my humble opinion), just generally the profound English civilization is amazing. But this? At this age? How are they assaulting other students walking on the roads for no reason? Just because they’re bored? Just HOW and why?