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There are a few factors, environmental chemical poisoning is one commonly talked about.

Another factor is lack of exposure to the act of killing. Men used to kill for their meat. It was common for the household to have a few goats or chickens. Hell even fishing for sustenance. Those who were caught practicing witchcraft or pedophilia were killed by the village. Violence was accepted and embraced as a form of justice. Now, we are told "violence is never acceptable" even though the male brain craves it.

Men do not battle the elements anymore. Every modern "man" spends his days indoors with climate control. It used to be that only the women were inside the home doing domestic duty. Now, many men "work from home" and do not weather the elements or perform much actual labor. The human mind will subconsciously believe it is a woman in these situations.

Perhaps the final blow, however, is the emasculation of accepting the authority of a woman. A woman boss, a woman governor etc. Our brains are hard wired as men to follow a strong male leader. A woman giving orders is enough to again subconsciously convince a man that he is a woman.