There's a question I hear all the time. It's an easy one to answer.
They don’t do it because they’re bored, or because they live in 'deprived' areas, or 'there is nothing for young people to do’ or any other fashionable excuse, dreamt up by naive people usually in posession of a beard and a degree in Psychology. Each of these excuses is easily dismissed. Do we seriously imagine that there was more entertainment on offer in, for example the 1930s or that people were less deprived then? The answer is simple.
Kids misbehave because it's fun to do so and there is no longer any reason not to.
Have we all forgotten how enjoyable it is to hang around in a gang as a teenager and intimidate terrified adult passers-by? It's great entertainment! I'd do it this very evening if Mrs. Chalk didn't keep me in check by being the equivalent of the old fashioned village Policeman.
Kids have formed gangs and misbehaved since the dawn of time_it's perfecly natural adolescent behaviour to explore the boundaries of accepted behaviour and to push and prod them a bit. We learn where these boundaries lie by experiences at home, at school, what we see and read in the media, from the way adults behave in public and finally from the Police.
Nowadays many parents have abandoned any attempt to bring up their children. Lots of schools have given up trying to impose rules they cannot enforce. No sane passer-by would dare tell off a group of teenagers behaving badly for fear of being stabbed, and there are only about four coppers per city; three of whom are behind desks, busy filling in forms and the other one is attending a 'gender awareness' course.