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?
I think incels are a group of sufficient size that you can just state relatively is that all of the above are likely to be true to some portion of them whether that be extremely negative experiences with women such as abuse from a parental figure, they mentally don’t connect well with the women they meet and thus are unable to form meaningful relationships or they just fell into it and are on the edge and not in the deep black pill stuff but identify with the word.
https://home-affairs.ec.europa.eu/system/files/2021-08/ran_cn_incel_phenomenon_20210803_en.pdf presents three main ideas (on page 4) being
https://www.psychologytoday.com/au/blog/finding-a-new-home/202301/new-research-on-why-incels-hate-women?amp Whereas this one (looking for the extremist and violent incel subcategory of incels) basically hits upon every possible reason from abuse to indoctrination to just active toxic masculine.
Adding this link, though it doesn't seek to answer the "why" as much as describe the "what"
https://www.cambridge.org/core/journals/bjpsych-advances/article/incels-violence-and-mental-disorder-a-narrative-review-with-recommendations-for-best-practice-in-risk-assessment-and-clinical-intervention/6A934637D21AEE4C1D90FAF5FB63D769
I can't copy/paste from that soutce on mobile, but it mentions many respondents to a questionnaire indicated they lived with their parents and had either depression, anxiety, or autism (prevalance in listed order).