Women do make less then men, but that doesn't have much to do with IQ since men and women have on average the same IQ. Women tend to not be as assertive and as a result don't ask for raises as often. Plus, women take more time off to raise a family. But back to IQ and criminality.

One's IQ is connected to race, ethnicity and environment. When one is developing as an infant and child: abuse, lack of nutrition, neglect, or damage to the brain can negatively impact IQ. Being breastfed and not being abused adds to a child's IQ (can positively impact IQ by one standard deviation), but the bottom line is one's IQ is limited by genetics. For example, the height of someone who ate healthy and got plenty of exercise as a child, is still limited by their genetics. Why wouldn't this also apply to mental aptitude? One can argue that crime is linked to poverty and not IQ, except in places like West Virginia where the population is white and extremely poor, the crime is relatively low. If you don't think IQ and aggression are linked, you should consider visiting a prison sometime.

I'm not saying every low IQ individual is prone to crime or that there aren't smart people from all races and ethnicities. These are averages. There is a bell curve as JP has explained in the past. Interesting topic one could go on and on about. I recommend looking up the IQ of different countries then compare them to their crime rate. I understand that many of these low IQ-high crime rate countries don't have access to the best food/use violence to discipline children which negatively impacts their IQ. Plus, many of the smartest people migrate to nicer countries which lowers the averages.