Women dating deadbeats

How? How does a woman date a deadbeat father? How does a woman get with this man knowing he has a child (or children) that he doesn't take care of and is perfectly fine with it??? 
Like to me that is a huge turn off, I think it's pitiful when a man can jump in a relationship with a new woman and go buy her things, and take her places but can't take care of the child he has, and I personally think the woman is just as bad if she KNOWS he has kids he doesn't take care of.