Well, in the US scientists have found that “males with a particular form of gene called MAOA are twice as likely to join a gang, compared to those with other forms”, this from “a new study of more than 2000 US teens. What’s more, gang members with these mutations are far more likely to use a weapon than other members.”

So there you go. The poor dears can’t help it. It’s not their fault. Blame it on mum and dad.