history is full of episodes of mass rape, and some of these episodes have dramatically altered the genetic make-up in very large regions of the world. the mongol expansion was particularly brutal. roman civilization traced it's founding to one such event, and while it may have been somewhat mythological, the broad pattern is observed through virtually all mass migration events from the steppes to the coasts and it's hard to believe that the roman invasion of italy would have been any different.
the reason that rape is so hard to defeat is precisely because it is so embedded within who we are.
to an extent, men have one task of procreation; women have the resulting task of finding the right sperm and rejecting insufficient mates. it is imperative, for the health of the genome, that women be allowed to discriminate. and, yes, this is crude; as a voluntary celibate, i don't live in this world and am the perfect example of how it's possible to get past it. but, the base genetic reality is a brutal arms race.
i have to wonder what extent that the cultural rejection of homosexuality plays into this. i suspect it's substantive, as nurturing relationships between these 'incels' is probably the best way out of this problem.