What kind of political leftist would you say resonates most acutely with Scott Alexander's January paean to the scientific racism of Emil Kirkegaard and Richard Lynn ("How To Stop Worrying And Learn To Love Lynn's National IQ Estimates")?

The ones who want to confront reality even when it has unpleasant truths rather than believing comfortable lies.

"Elites are making it taboo to talk about intelligence in order to preserve their position at the top of the social hierarchy. They're doing genetic engineering for their kids in secret, while making the topic of intelligence radioactive so the masses can't follow suit. If we reduce the taboo around intelligence, we can decrease global inequality, by improving access to maternal interventions for IQ in the developing world."

(Granted, that's not a common leftist position. But maybe it should be.)

That is an inaccurate, reductionist comment. I encourage folks to read that post if they are interested.

Having not-yet read the post, I appreciate your very practical response. “Read the thing you’re criticizing” is great advice.