they also claim that people with high IQs are better than people with low IQs.

But they pretty much are by LW standards! It's not just that higher IQs correlate with irreligiosity and liberalism & libertarianism (as one might expect from LW's userbase), but they also correlate with honesty, low discount rates, willingness to cooperate, dislike of coercion, judicious investments, positive externalities (from R&D) and so on and so forth. I've been compiling cites on all of these if you want to read more.