Alot of the reason why crime rates increase. But mostly, it could be boiled down into these basic reasons. First, poverty rates. The lower the poverty rate is in a given area or country, then the lower the crime rates would be. Desperation from hunger is a good reason to do crime. Next, enforcement of the law. The stricter the enforcement of the law is, the lower the crime rate. I mean if you're not going to jail and no one will rat you out then you will do the crime. Lastly, it is the general ethic of a given community. If the people in the community are jerks, them yeah crime rate would increase