The actual issue is not due to men not being able to get a gf, have sex, etc. The root of all of this comes down to the fact that these men have legitimate mental health issues and one of the results of this is not being able to date, have sex, etc. Very few women are going to ever spend time around men like this, so naturally these guys will end up sexless. The men may think that there issue would be magically resolved if they did in fact get a girl and have sex but that really is not the case, as their issues have nothing do with women but instead have to do with themselves.
These men find something in common with one another, in this case they think their issue is a lack of sex, and they congregate on the internet and start this incel rebellion.
This should be a sign that our society has become very sick and warped and that there is a legitimate serious need for addressing mental health issues. There are literally tons of guys here in the U.S that never get sex at all or very rarely and yet they are still relatively normal and functional members of society.
I struggle with women, why that is I really don't quite know, and yes it is frustrating and insulting to me, especially when I'm doing better than the vast number of other men out there and the women I've actually tried to make something happen with. However, I don't go planning mass shootings or some sort of rebellion against society because of it. Instead of doing that I just focus working extremely hard on things that better my life (working out, making money, furthering career/financial prospects, etc. ). The difference is that I am a relatively normal, stable and functional human male.