Incels also hate the cruel world that made them and the politicians upholding it. The problem with women isn’t, according to incel ideology, that they refuse to pick a partner. It’s that they pick the wrong partners. That’s where the dreaded “nice guy” comes from.
So according to incels this doesn’t harm women enough but rather creates a tax on “normal men” for being “normal”. (And then they turn around and call themselves degenerates because their ideology isn’t the most consistent)
Also if you are in these communities for long enough, then it becomes part of your identity. That’s how we get stuff like wizardchan. (People who believe that still being an incel at 30 makes you a wizard). And this is an attack on that from the outside.