Psychopath implies lack of empathy so I don't think that's quite the word you want. You could maybe repurpose "psychotic" though!

Maybe lack of M&Mpathy?

“ As it turned out, there is nothing special about psychopaths when it comes to understanding or feeling empathy with others. ”

https://www.psychologytoday.com/us/blog/fulfillment-at-any-a...

But maybe it is like so often more about the contradictory definitions of “empathy”, and capability vs. willingness.

That's interesting! But confusing as well. The test they reference (https://en.wikipedia.org/wiki/Psychopathy_Checklist) includes lack of empathy. Are they saying that this criterion could be dropped from the test with no effect on the classification?

How I understand the article, is that they understand why others act in certain ways, they know the mechanism of empathy, but nothing here confirms that they are empathetic themselves. I think this article's conclusion is misleading.