You found something inaccurate about "The Bell Curve"? Or do you just not like evidence that contradicts your view? (Statistically there are a lot more muggers than there are people who have cured cancer, so of course my assertion is correct, but I'm guessing you don't like statistics either.)
Is there evidence that highly intelligent people are more likely to have intelligent children? Certainly.
Are children who are raised in underprivileged areas less likely to succeed? This is generally the case.
However, eugenicists like you operate based upon the immoral assumption that those likely to be high achievers have more of a right to live than those who aren't.
My IQ is above 150, my family is very wealthy and I was raised with every imaginable advantage, yet it would be unthinkable to me to believe that I have a right to life that others don't. Rights come from God, not genetics or culture.