Campbell set about a group of toddlers with a 2ft machete because he thought they were "little devils". He heard their voices taunting him, calling him "******". Christopher Clunis, known to be mentally ill, also heard voices taunting him with racist jibes. He stabbed Jonathan Zito to death in an underground station.
Last year, Stephen Laudat, a known paranoid schizophrenic released into the community without any medication, stabbed Bryan Bennett 82 times because he believed that he was was Ronnie Kray. An independent inquiry into the killing concluded that racial prejudice and poor co-operation between doctors and social workers helped turn Laudat, 26, into a violent killer.
All three were black men, tormented by real or imagined racism. In each case the authorities, through ignorance or prejudice, failed to give them appropriate treatment, and innocent people were hurt or killed.