I believe we enjoy hearing other's complaints, so long as they are entertaining enough. Its similar to the reasons why people listen to rumors. After hearing only one side we nevertheless feel informed, unless we are anxious or have experience. Some people who tend more towards anxiety will be more likely to see problems with the one side, but most people will feel fine. Anxiety is such a curse when hearing one side only.
I think incels are the result of the anxiety surrounding marriage. Most incels are probably older, but there are plenty of young ones. I think a good place to look for causes is Japan where young people are opting out of marriage. People have seen how unhappy married life can get, however without marriage or civil unions relationships get a lot harder to establish.
Also nobody is taught to dance, and families put a lot of religious strictures on their kids. Its like pressure to be something you are not confluxed with pressure to be honest. Families have this crazy belief that they can genuinely make their children believers, and there is a lot of emphasis on acting like a believer. Go into almost any church. You must act as if you are the biggest believer on the planet, or you are a space alien in there. And nobody dances. I mean the alternative is a dive bar. That's it. You meet people at church or in a bar. Those are your choices.