The Nottingham attacker, Valdo Calocane, was sentenced yesterday to a hospital order for manslaughter with diminished responsibility of three people: Barnaby Webber, Grace, Omali Kumar and Ian Coates. Families of the victims spoke outside Nottingham Crown Court and said the sentence did not provide justice and that Mr Calacaine had got away with murder and this tragedy poses serious questions about violent crime in Britain. Perhaps best asked by Mail on Sunday colonist Peter Hitchens First… how much of violent crime in Britain is caused by mental health problems? Second, what is causing thes…