Not offended, but yes it is correct. Look it up. The Canadians have done more more on this than the US. It is correct that most are committed in that IQ range and the major contribution to it is Fetal Alcohol. I know this as I'm heavily involved with adoptions. Fetal alcohol is a major problem in the adoption of older (non baby) kids. Anyway, that's why I know it. All crimes? Of course not. Fetal alcohol damages the impulse control region of the brain.
There are plenty of scholar articles on it, but here is one that is a synopsis.
http://www.come-over.to/FAS/zakreski.htm
Not going to argue about it. You can look it up yourself.