Also, if we can admit HBD is true it will become acceptable to publish social science studies whose conclusions make racial differences in inteligence obvious. Maybe, that will help with the current crisis the social sciences are in.
Imagine trying to do astronomy, or physics, without being able to admit that the Earth goes around the Sun. In fact, I caould imagine a 17th century inquisitor making a similar argument to yours about "supposing heliocentrism is true", and he would have had a much better case than you do.
In both case what both you and the inquisitor fail to realize is that truths are entangled and lies are contagious. Lying about heliocentrism requires one to lie about nearly everything in physics, similarly lying about HBD requires one to lie about nearly everything in the social sciences.
Original thread here.