Girl gangs, mugged pensioners, drunken youths - it seems there is no escape these days from headlines about horrific crimes in "yob Britain". At the same time, popular culture revels in ever more graphic portrayals of violence, yet grows increasingly indifferent to its consequences. In the first of two programmes, Wendy Robbins examines whether we are losing the fight against Violence and against its causes. Producer Simon Crow (R)