 David Cameron criticised the Labour Government 's criminal justice system and the absence of father @-@ figures in ethnic minority cultures , which he claimed as causes in the murder of Pryce . Cameron stated that lack of strong deterrent sentences for knife crimes and the failure of police to stop prolific criminals had played a role in the killing of Pryce . He insisted that parental background had a key role in preventing crime and called for zero tolerance of knife crime , claiming that not enough criminals were being sent to jail . 
