Crime is not always disproportionate to low-income people. Certain types of crime, yes--and certainly the most visible types of crime (like assault or robbery or murder/manslaughter)--but there are plenty of crimes which tend to be overwhelmingly comitted by people who are NOT suffering financial hardship (say computer fraud for example, or insider trading, or embezzelment, or malfeasance or such crimes). The more "violent" crimes tend to be commited by people with low incomes most likely because a poor criminal doesn't have the tools available to commit the more sophisticated types of crimes. If don't have a computer to crack into the target's bank accounts, you can still break his legs and steal his wallet.
Then there's other crimes that are pretty common through all income levels, such as domestic violence. Of course the image-conscious wealthy are less likely to report such crimes which will skew statictics.
Another thing which will skew the statictics is the statistics are usually based on CONVICTIONS, not as much on cases filed--and it is a simple fact that the wealthy can get better legal representation than the poor can. This isn't right from a moral standpoint, but like it or not that's how it is.
Crime is a big problem. But calling it just a "poor" problem means turning a blind eye to some of the worst crimes comitted.
J_A_B