[cgk]

There's been some opinion written on this phenomenon. Some of it (interesting, possibly factual), is Here.

The sheer outrageousness of loving a man who has murdered causes a woman to transcend her feelings of low self-esteem, of vulnerability. The thrill of her relationship makes her feel alive and important. By controlling the melodramatic events in their lives, women who love men who kill get a false and temporary sense of power.

[TheSpottedOwl]

Wow, what a weird link. There are some screwed up people in this world.