I would say everyone has a sense of empathy. Even the most diehard conservatives have this, everyone but literal sociopaths have empathy.
The problem is that some groups only have empathy for in-group members, and have none at all for outgroups.
The question is, do Incels feel empathy for "normies"? Do "normies" feel empathy for Incels?
I can feel empathy for Incels. I want very much for them to get out of the cult and have healthy relationships. I have absolutely felt frustrated with a world wherein I was unable to break through to having healthy relationships. I want to see them get there...
But with all this machinery overlaying their situation with radicalization, the effort of accomplishing that rises sharply, past the cutoff for being in any way worth the effort. It's easier, at this point, to toss them down the memory hole and find better people than to deprogram them.