WRT ZPG, I used to agree with that. Then I started thinking of it more in the sense of Darwin. If the smarter people don't breed, what does that give us but lots of stupid people. This is not a good thing. I'm not casting aspersions on this particular family since I don't know them, but it certainly holds for the US or any other group you're a part of. If you don't breed, the other groups get bigger relative to you, and yours shrinks.
So now I'm a believer in ZPG, but only for groups I don't like.
