I'm going to put on my flame-retardant suit here and offer a couple of theories:
1. They are losers; or,
2. They are the type who want the bad boy. The type who will marry a man, even though he has slapped her around the entire time they were together, before the marriage. Then, when they have lost enough teeth, and have had their fill of broken limbs, they will go on shows like Oprah and launch into a crying jag about how there aren't any decent men around.
Some decent men are being rejected because they aren't "exciting" enough. I guess nothing compares to the "excitement" of a bad boy coming home drunk or stoned and ready to kill someone. Popular culture celebrates the violent bad boy on one hand and the wimp (as if to make up for the excesses of be bad boys) on the other. Boys of one sort or the other are wanted, but not men. Some foolish women have bought into this. One can never underestimate the power of stupidity.