Reminds me of a friend who lived in London, in a really rough area but there was never any street crime, car thefts or violence. A nice, leafy, peaceful street. Turned out his next door neighbour was the biggest drug dealer in South London and he didn't want any trouble on his doorstep. He was really nice bloke apparently!
The only drawback was the Police would turn up once in a while at 5am as if he'd be stupid enough to keep drugs in his home.