You've obviously never lived with one.
I had to grow up fast.
My mother told me growing up that I needed to push him, to be his example. When he doesn't want to follow his younger brother, he beats the crap out of his younger brother.
He is now living off of money from my parents will. He doesn't know how to live. I've been to his house a few times, and he stays upstairs, watching youtube on his phone or playing some Plants Vs Zombies game. He is 29.
It isn't so much their life, but the lives they affect.
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And I'd also like to point out that science has been wrong before. They told my grandmother to drink 2 beers a day when she was pregnant with my mother. She didn't, but what would have happened if she did? That's right, FAS.