They're told that kids are time-sucking money pits that will grow up to hate you after making you fat (because your diet will become Kraft mac-and-cheese and chicken nuggets), miserable, and unable to have any personal interests other than poop and puke, so it's best to not have any because you won't do a good job anyway, it's bad for the environment, and you don't want to become one of those Facebook people with their kid as their profile picture, do you? DO YOU??