To bring up more things in the broader context, were there not several "grooming gangs" that were active in Britain recently and the police were reluctant to investigate/prosecute them as it might appear racist?
there are literal no go zones the police will not touch out of fear. If you can't figure out how law less zones and being socially untouchable could make doing crimes easier and harder to prevent, then there is nothing that could convince you.
But please give some more details on that. The only case I've heard about was a single attacker who was incorrectly called an immigrant.