Definitely OT here, but germane to the above discussion...
I think many problems, such as incel, arise, sadly, because of biology. (I'm not referring to this specific case!!!) We intellectually know that there should be no difference in how males and females are treated, now that we have progressed from the hunt-to-survive history from which we've evolved. Biology doesn't catch up to societal changes very quickly, unfortunately.
Testosterone and estrogen play a part in all of this. In a HUGE generalization, we see men trying to "win", while women try to smooth things out so that everyone will get along. We see women attracted to men with money/power more so (note that I'm saying 'more so') than men, who are more attracted to women's looks. Of course these old biologically based factors have weakened, but that doesn't happen overnight (i.e. hundreds of years). And, during this evolution, there are dislocations and people feel out of place.
I say this as a woman, who has had the joy of working in a male-dominated field for many years. I remember my stepmother telling me, many years ago, that all female managers were *****es. (I was a female manager at the time.) Of course I was offended. But I wondered why so many people said the same thing. I realized that we, as a society, do not like women to be forceful and confident. When women do it they are *****es. When men do the same thing they are leaders.
Sorry, this has been a long-winded way to say that some men can't overcome their testosterone and revert to their "I deserve to dominate" mode. Unfortunately, in many extreme, less progressive, cases this is really ugly. (Conversely, some women can't overcome their estrogen. And, in many extreme cases, they are stuck playing the victim. And some are clearly truly victims.) It's human nature. It's wonderful that we have great men and we have great women and we support each other. We need both! This is what makes life wonderful.
But we CANNOT accept women being violently targeted because some males can't move on; that some males blame the women, when it is NOT THEIR FAULT, and then take it out on them, denying them their life. I believe that these incels are working on the bassist (base-ist?) of instincts...only focused on their base-sexual instinct. I don't think they have the depth of intellect and emotional intelligence to deal with where society has progressed to.
I think that this case is one of those situations. The perpetrator, did not have the emotional intelligence to deal with life beyond his base biological instinct. Unfortunately there were many innocent people who paid the price for his 'challenges'. :maddening: