Problem with that is that there's a very small window in which saving an incel/femcel is easy. Before that window, they're generally still normal but maybe withdrawing. After that window....interacting with them just kinda sucks. You need to have a certain willingness to deal with excessive self-deprecating sadness and basically make life worth living for them.
Incel/femcel communities stew in that toxicity, so it's easy to add your own toxicity to the stew. Normal people don't want to put up with that shit.
Source: a dear friend from back in the day dealt with my nearly incel ass, preventing me from falling all the way down the hole.