Canada

It stems from a victim mentality, envy, and ego.

When they're chronically online and immersed in social media and entertainment media, they're surrounded by portrayals of happy couples, love, and romance. Eventually, it skews their perception into thinking that they're the only ones who are missing out. They start to feel like life is unfair to them, with love and sex being out of their reach.

That grows into envy and hatred towards men who have experienced it, and especially those who have above-average success with their romantic lives. They compare themselves to those men, convincing themselves that the reason other people are more successful is because of superficial traits like conventional attractiveness or money.

While all that happens, they refuse to consider that their lack of success could be due to their own behaviors or negative attitudes. It's always something else that is stopping them from experiencing love; their ego is protecting themselves from hurt, avoiding the necessary but painful introspection that would snap them out of it.

It culminates in the belief that both women and other men are the reason for their nonexistent love life. They become openly mysognistic, but they also think poorly about attractive men—they just don't show it outside of incel communities because they're afraid to get their ass beat.

And all of that was before this red pill shit. The red pill movement exacerbated it by catching them at various stages throughout their incelification process, affirming their beliefs, and then hooking them in further so shitbags like Andrew Tate can profit off of them.