Frankly, when I mentioned Murray, I didn't even have in mind these most controversial and incendiary topics he's ever written on. (This was in my opinion a mistake on his part, since his association with them now automatically detracts from other interesting stuff about which he's written much more.) As you note, you don't have to go anywhere as far to get to ideas that will be unacceptable to the modern mainstream ideological consensus about issues of education, which will provoke angry denunciations that deny any legitimacy to your position instead of rational debate.