That's the 'noble primitive' myth. It's only a myth.
I wasn't talking about the idea that people in smaller tribes were inherently more moral people (which is what the noble primitive myth deals with), but that crime is low because of social pressures in small groups (where everyone knows everyone, and it is harder to get away with crime) or for other reasons. My point was that crime rate is smaller in a smaller social group, but more and more people prefer to live in/around cities.
depends on the type of crime, i guess.
i know that at least homicide is much lower in today's "western" society (about one in a hundred thousand per year) in comparison to contemporary hunter-gatherer tribes (one in a hundred to one in three thousand).