The idea of the mythical past. The narrative is that in the past, all men got pussy. So long this idea is believed to be true, all incels will be right-leaning.
The idea is all men had dominance and they had sex. Gender roles were natural and stable. Things were perfect, nobody was incel "in the good ole days". How old these so called "good days" are depends how much the individual incel excavated back in history. The average is they go back to american 50s and 60s but some started to idolize monarchy or past centuries.
They quote selectively. They say in present days people are more incel than in the past. They avoid to mention in the past all men were sent to the meatgrinder doing pointless wars. Its very very convenient of them to avoid mentioning it.
This single idea keeps the whole entire right wing glued together. A right wing that is incoherent, patched together with glue and spit and ducktape, is held together by this idea that in the past life was good and foids were submitted. Im not even joking, if you wish to build a leftist perspective start from this idea. Undermine the idea of the mythical past, and you will awaken the incels. Later you will provide the true light of the blackpill.