I am sorry to hear about all the Damage, and Vandalism that is going on all over the place, by the sounds of it it seems to be a national problem.
As for the reasons Children, or teenagers do this, well many have been stated, just a thought along the way....................
I have a 22 year old step daughter who has had all the love and attention you could imagine, a Fantastic Mother that tried her upmost to keep her on a descent path, me (Dont start lol) and i have really tried my best to be a Friend rather than an Authority. Now the line that she has gone down is so disgusting that i will not reveal on here, but suffice to say, i donīt think its either the fact that children grow up with or without parents that are the reason for criminal damage and Anti-Social behavior, its more like a Lemmings point of view, one starts and all will follow, perhaps just for the kick.
Never the less they should all be openly thrashed ntill they drop and branded with the words anti-social, or respectless on their forheads.