And if you marry the cute girl from the poor abusive family, her standards for you won't be that high. Neither will her family's.
So, if some asshole cuts you off on your drive home, you can slap the taste out of her mouth as soon as you walk in the door and she won't call the cops. Hell, if you slap her less than 5 times a month, you'll probably get a hummer as a reward for being such a great husband.