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...killing women is an extension of mate-guarding. Men become morbidly jealous when their mates spend time with other men, and in their attempt to control their mates' behavior, sometimes through violent means, many of them end up injuring or killing their mates. Because men of all ages are more motivated to guard reproductively fertile younger women than older women, killing women is better predicted by women's age, not men's age. In other words, men, regardless of their age, are compelled to guard their young mates through violent means and occasionally end up killing them. Since many older men in their 40s and 50s are married to younger women (sometimes considerable younger), some of these men are expected to kill women (their mates) in their fits of morbid jealously and thus deviate from the typical age-crime curve.
Interesting use of the word "many."
I'm not sure if the paper mentioned it, but I'd say addiction is a leading factor in violent crime. People do crazy things when they're addicted to drugs. And seeing as males are generally stronger than women, and have a greater physical (and mental?)capacity for harming others, they're probably more likely than women to commit violent crimes in persuit of satisfying their addictions.
Actually he/she is talking about things imprinted in us millions of years before meth was a household name. Things that we subconsciously, like selecting a mate, why moms love their kids more than dad etc. If you repeat some of the stuff, you'll be chased out of the the country for being politically incorrect :) (for example according to another paper women make less $$ than men, because having money doesn't help their reproductive chances; looks and youth do.)
Being a violent criminal is not that good for sexual or natural selection; there's always someone who will beat your @ss, and you might be thrown out of the group--essentially a death sentence back then. Here he argues that men try to impress women with their aggressiveness (sign of testosterone?) and they also try to get enough resources to support the family (poor ones commit more crimes.) If you see his chart, crime amongst men starts right after puberty and drops drastically after the first child is born. For most, it's mission accomplished: I found a woman--one way or another--and passed down my genes; no need to be violent anymore.
As far as crimes: Addiction is addiction, and I would say that women commit different crimes (i.e., forge a check vs. beat someone with a brick to get the $20 for crack)
