I think a lot of incel stuff is economic. Lost men without jobs or purpose in life. Used to be a blue collar man could get a job doing physical labor and work off a lot of aggression that way and have some sort of purpose in life. Now there's just a lot of lost men like people have written about. I don't think it's a coincidence a lot of this stuff started really fermenting around 2008.
"At this writing, nearly 7 million civilian non-institutionalized men between the ages of 25 and 54 are neither working nor looking for work — over four times as many as are formally unemployed. Between 1965 and 2015, the percentage of prime-age U.S. men not in the labor force shot up from 3.3% to 11.7%."
It's also the Internet. Social media like people have written about above but also easy access to porn and cooming. I bet if in order to see naked women and coom you had to have a job and socialize at a reasonable level, more men would be doing that.
Obviously this is only a part of it though.
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Also I've long thought people on this site pretending pooners are just as bad and perverted as troons are on one.