Right on the money, as usual, Sasch.
The article did differentiate between innate "intelligence" vs. "education", which I think is an important distinction -- there's so much we could do to give less innately gifted individuals better chances in life through early childhood education, which would help tease out some of these correlations (e.g., does empathy correlate with education, or with intelligence?).
I find some of these responses interesting, though, because they're indicative of exactly what the article describes: our current societal attitude towards stupidity, associating stupidity with abusiveness, or lack of empathy. Even if we're asking questions rather than making assertions, it's still instructive; for example, I don't think we would be asking whether one's race or sexuality is correlated with these attributes.
While reading this article I was basically trying to decide whether this is another axis upon which I have unconscious bias, and should work on, or whether this is a step too far in social-justice-warrior political correctness. Like, is the next step an article about "The War on Bad People," arguing that bad people aren't bad, that good and bad are just natural differences and we should embrace both? Or am I an able-ist elitist?