However, I do not think there is a danger for the human race, because the range of abilitly to learn has always been on a bell curve, hasn't it, and therefore even if a child is born with a quick, inquiring mind, he or she will, generally speaking, find a way of learning even if the home background is not conducive to doing so.
I'm sorry. I don't really understand what this means. I think that you are suggesting that intelligence is normally distributed and that intelligent children will thrive despite their backgrounds. There appears to be an assumption that because of this the "right" outcome will always prevail, even though (because intelligence is normally distributed) there will be equal proportions of "intelligent" and "unintelligent" people
I suspect Walter's conception is that there are intelligent people who are "smart" and that there are intelligent people who are "stupid" - smartness and stupidity being a judgement that results from the outcomes of their actions. Who knows, Kim Jung-Ill may well have a high IQ.
As may Theresa May.
As may Donald Trump.
"Smartness" may depend on contemporaneous environmental factors. Theresa May's perception of what to do about the EU is constrained by her environment. My guess is that she is trying to arrive at a situation where she will have all the economic advantages of membership while satisfying a perception that the national will is separation from the EU. Her objective seems to be constrained by the context in which she is working - the Conservative Party.
She may well be "smart" in that context but "stupid" in a wider national context. I think that she exemplifies the Peter Principle.