Well some are probably are the result of self loathing, I honestly think most of them are just terminal stage coomers, the worst of the worst.
Look at modern porn, its absolutely god fucking awful projecting an unbelievably unrealistic image of human sexuality. You really have to go out of your way to find stuff that is remotely "normal". What happens to the average flat foot when they dont have the higher level cognitive function to avoid that all the while living in this modern dystopia where theyre more cut off from the opposite sex than ever before? Combine that with theres no way to morally police these people and you end up with BNWO.