Why do women complain that men are jerks but then positively reinforce bad behavior by dating those guys?

Well, y'see... Girls like weirdos. It's been a fact since time was time. Even if they don't want to admit it, bad guys appeal to something sick and wrong that lurks inside even the most prudish of girls. The girls with more common sense have learned to suppress these tendencies and realize that the nice guys are always the better choice. The dumb girls... Well, you don't want to hang out with them anyway.