Poverty does not cause crime. Taoudenni is the poorest place in the world, and they don't even have a word for crime. The couple of times a year when there's a disagreement between two men (the population is 100% male, because the environment is so harsh the women and children live hundreds of miles away and the men see them a few months out of the year) the village elder comes up with a solution and everyone accepts it as final.
What causes crime is relative poverty. If very poor people live in the same area as very rich people that conflict causes crime.