I used to live in a peaceful little village - there was crime there! There was even murder! it wasn't as frequent simply because the area was sparcely populated
There's "more" murder and assault in cities because they're more hightly densly populated, not because you're more likely as an individual to be murdered or assaulted, or because the average person is more bad.
When you REALLY need to worry about a town, is when the assualts and murders STOP making the news! If it's still "news" chances are it's still shocking/rare enough to not affect the average citizen directly