The fact is, men have been killing women who reject them for ages. The problem is now that, due to higher population density and guns existing it's much easier to get revenge on "society" aka women. So unless you're saying society has treated men as disposable for thousands of years, that explanation doesn't hold water.
It is their explanation and rationalization, for sure. But where are they getting their confirmations for their victim complex? They turn to other, likeminded people on the internet. INCELs might be an internet fringe group, but the ideology that permeates it isn't that fringe at all. It's the idea that women are emotional, cruel creatures that go for the asshole.
Same thing needs to be done as with other terror attacks: look at the ideology and socio-economic situation. We need to start accepting that incel/red pill theory is misogynistic and that the perpetrators of these attacks irrationally hate women. Reinforcing their ideology is not the way to go.
By the way if women liked assholes there would be no incels. None of these guys are socially attractive at all.