From a New Yorker interview with Fran Lebowitz:

Has this crisis shown us anything about Donald Trump that we didn’t know before?

No. Every single thing that could be wrong with a human being is wrong with him. But the single most dangerous thing about Donald Trump is how unbelievably stupid he is. It’s not the most dangerous thing in someone who has no responsibilities, but in a President it’s the most dangerous thing.

His absolute belief in himself, that is something that is not going to ever change. And he doesn’t care. When people say he’s not showing enough empathy—he doesn’t know what it means. Whenever he uses the word “love,” which he does occasionally, I think of the word “algebra,” because I don’t know what algebra is. I took Algebra 1 four times, because I failed it four times, and I still don’t know what algebra even means. I know the symbols. And that is what love means to Donald Trump.

I think he knows what the word “love” means in one of its senses – he loves fast food, he loves grabbing women by the pussy, he loves insulting people, he loves applause, he loves attention, he loves center stage, he loves a parade. But in a sense that goes beyond personally relishing a treat – no, I think she’s right, he doesn’t get that.

As for empathy – no question, he has no clue what that might be.