MarjorieChardem it's absurd to say 'but what if he gunned down a school full of innocent kids'. He didn't do that.
Two specific bullies chose to follow him in order to bully him. It's not comparable with shooting up a school.
It's not necessarily the case that he's a total psycho, I can't say that my son (now 11) if exposed to 8 years of bullying wouldn't do the same thing. That's not to say that my son is a total psycho, just that having that happen would fuck with anyone's head.
As it happens I'm fortunate that
(a) I don't live in a block of flats, I live in a nice detached house in a nice road without any bullies
(b) my son goes to a private school and though he is vulnerable to bullying, his school is very sheltered
(c) I can afford to protect him (move school, move house, whatever) from this
so my son will I hope never be exposed to this.
This boy didn't have that, he lived in a really shitty part of Southampton and his parent(s) probably were not financially in a position to protect him from that.
According to the comments here: www.yorkpress.co.uk/news/10750700.Residents_tell_of_their_shock_after_attack_on_teenage_girls/, this man (like my son) has a form of autism and it would perhaps have been the cumulative effect of years of this bullying that got to him.
That doesn't justify stabbing people, but it does explain things a little better than calling people psycho.
My guess is the real problem in this area is widespread anti-social behaviour, affecting many vulnerable people (not just this man), but it suits some people just to write him off as a 'psycho' and ignore the wider social problems.