 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 . 
 David Cameron criticised the Labour Government <a href='null_genetive' title='1'><mark>'s</mark></a>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 <a href='been_done' title='2'><mark>had</mark></a> 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 <a href='uninflect' title='3'><mark>were</mark></a> being sent to jail . 
David Cameron criticised the Labour Government  criminal justice system and the absence of father @-@ figures in ethnic minority cultures , which he claimed as causes in da murder of Pryce . Cameron stated that lack of strong deterrent sentences fa knife crimes and tdafailure of police to stop prolific criminals done played a role in the killing of Pryce . He insisted dat parental background had a key role in preventing crime and called for zero tolerance of knife crime , claiming that not enough criminals was bein sent to jail .