Any time a group of people is open to anyone joining it's going to get ruined by the awful people using it as an excuse to be awful. Doubly so when the original group of people is emotionally vulnerable and hurt.
Incel, Femcel, doesn't matter. Makes no difference to awful people what they're called if they can get in a group to collectively fantasize about being more awful than they could get way with in real life. I wish the actual people that are hurt can get the help they need to get better.