Feminists

Men and women express psychopathology differently. Men are more likely than women to kill random strangers, women tend to keep their murderous impulses closer to home. Andrea Yates didn't go round the twist and start shooting strangers at a school or a mall: she drowned her own children.

Of course, there are numerous cases of men killing their children, and a woman is far more likely to be killed by her husband than a man is by his wife. But on the whole, if a woman kills anyone, it's almost always a family member.

And there have been recent cases of women strapping dynamite to themselves and detonating it in a crowded market, but your average suicide bomber is still usually a male.