When my Dad was a boy he used to put dog poo in letter boxes (amongst other 'tricks'). I don't think it would be acceptable for someone to open the door and have stabbed him.
I agree that antisocial behaviour is horrible, intimidating, and very hard for the victim but that is the fault with the current policing system not picking things up. To open the door and stab someone is kind of a nuts response imo.
I wasn't saying it was an acceptable thing to do but urine or dog poo through a door is disgusting and a fragile person can be pushed to the limit by such things, sadly in this case the limit was the taking of one life and the ruining of another.
And if it is nuts to respond that way then a prison sentence without coresponding
professional psychiatric help is the wrong punishment too. This man is a victim too and although he does need to be punished
I don't think it's unreasonable to also pity him as a victim who was pushed to for by a gang of antisocial yobs.
Even the police gave a list of antisocial crimes the dead man and his friends were responsible for on that estate and
if those crimes had been dealt with more severely when they happened then this might never have happened.