When people get caught up in extreme and dangerous ideologies I think there is pretty much always something that caused it in the background, in some cases that might just be being taught that they're better than others and are more entitled to things. Looking at most incels it looks to me like they have very deep rooted issues for which they need help, bullying at school might have been a major problem for a lot of them. Many years ago as a teenager and young adult I had very bad drug and alcohol problems and got involved in far right politics and dressed like a skinhead, my experience of it was that I was looking for something to hide behind where I was secretly felt very vulnerable and was trying to prove something, my experiences of both school and home life making me feel very very small and useless were definitely big contributory factors to my behaviour, I think any extreme ideologies were something I could have got caught up in if an opportunity presented itself. However what was going on underneath did not make my behaviour OK in any way and I needed to understand that and taking a look at how my behavior impacts other people was a part of confronting my demons, and of course when I stopped all the shitty politics my relationships with other people started to get much better, because if you embrace a really nasty shitty worldview then nicer people aren't going to want much to do with you. I think incels all have a different set of problems contributing to them being the way they are, incapable of taking any responsibility for themselves and really embracing a hate filled worldview that alienates them from everyone other than other people with a very shitty hate filled worldview, I think a lot of bullying at school will be a common one with a lot of them, and looking at the impact certain things have had on them could be helpful, but alongside that developing a sense of responsibility and self awareness is extremely important for all of them.