Gangs and homeless camps are generally endemic to urban areas, not rural ones, despite rural low income groups having a far greater need to rely on cars to get around.
My thinking is that homeless folks tend to move towards city centers because they are more noticed, have more footfalls go past them and hence is easier for them to get food/change etc. They would not be likely to go to the suburbs because they are harder to get around, there are fewer people around to help, and it's very easy to get the police called on you for loitering around someone's lawn.