I don't agree. Every single person who actively violates the law should be prosecuted here.
During the massive London riots of August 2011, the police set out to arrest every single offender in the aftermath, and the CPS set out to prosecute every one arrested. The intention was for very rapid justice. The CPS admitted later that it was the single biggest challenge in their history.
To deal with the huge caseload, prosecutors were brought in from across the country and Courts were opened throughout night and day.
Statistically, two months later by October 2011, there were 5,175 offences recorded by the police nationally, with over 4,000 of those offenders arrested. A remarkable figure.
By June 2012, nationally there were 3,051 people brought before the courts - 2,194 in London. Over 1,800 years of jail time in total handed out by the courts by this time.
These figures dwarf the little pockets of looting and vandalism happening in Ferguson and elsewhere. There is no reason why every single offence recorded should not be pursued for prosecution, particularly given the considerable resources of the American justice system.
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Sources:
Parliamentary briefing on the August 2011 Riot
Evening Standard
BBC