I don't even have to argue with your cite (and I'm not a Plomin fan), since the numbers he's giving drastically slash heritability estimates from just a few years prior. If we were having this discussion 5 years ago, the claim would be that intelligence is 80% heritable. Now the foremost academic proponent of hereditarianism arguably concedes it could be as low as 20%. Molecular genetics numbers put it lower, in the mid-teens, with rare-variant hypotheses capping it there; that is: it could get lower, but it can't get higher (unless you come up with a novel mechanism).
I want to add: I put as much effort into my original comment disagreeing with your claim as you put into your casual assertion that some people are genetically inferior to others. I feel comfortable with how this discussion has played out.
I want to add: I put as much effort into my original comment disagreeing with your claim as you put into your casual assertion that some people are genetically inferior to others. I feel comfortable with how this discussion has played out.