Unlike the principle of universalizability, the principle of humanity can account for the immorality of what?

I believe the answer is the Principled fanatics
The principle of humanity stated that when interpreting a speaker, we need to assume that all of the situations that experienced by the speaker and all their principles are connected with each other, which make it possible for us to empathize with fanatics by trying to put ourselves in their shoes.

It can be peer pressure, also when they’re going through a lot of stuff at home