Something I’ve always wondered is what kind of women were in the lives of incel men when they were young. Did they have a bad relationship with their mother? Did they lack sisters or other female family members? Or is their family situation irrelevant? Maybe some particular situation in their early years caused them to develop a complex around women?
It's a lack of positive male role models in a person's life. If they see people calling women hateful evil sluts, they may assume any negative interaction with a woman is because she's a hateful evil slut, and they may not look inward. Don't have to look inward, in fact, because the answer is obvious - just a useless slut just like whatever podcaster has told them.