There is a simple solution to this: no one other than card-carrying scientists working exclusively on the evolution of intelligence should blurt out their opini

There is a simple solution to this: no one other than card-carrying scientists working exclusively on the evolution of intelligence should blurt out their opinions on this topic. This question should be clubbed with other questions which are always easy traps for any scientist into believing their opinion is valuable just because they "know how to do science". Better just stick to what field of science you are good and shut up about socially charged questions of no relevance to you. In this guy's, case, it is arguable if he's in the field. He seems to have already made up his mind on it, he's just out to find proof of his hypothesis. This is in principle fine, but he should acknowledge that by choosing to study this field, he excludes himself from any position where he's in charge of teaching or training people - he seems to sincerely believe that some of them are dumber by their nature, that seeems like a massive conflict of interest to me.