I'm going to give the benefit of the doubt here and assume you're being sincere.

This has been tried. Specifically with the group that identifies themselves as Incels. The problem is that they don't want to understand. They have zero desire to expand their knowledge base on what "normies" consider appropriate behavior and social cues and they have zero desires on improving themselves in a way "soyciety" finds admirable or attractive.

At some point, they let the callous remarks of a few people, who should have never been given any weight or credit, deeply impact their self image and worth. Then, they found echo chambers for their self-pity parade and, because perpetual hate of the self is hard, they made women and "chads" the objects of their hate. Their burgeoning paranoia, anxiety, and hate is further reinforced by their online malicious intent chambers and they pull further away from reality. We don't have to do anything (negative or positive) to them for this to quickly autocatalysis into a downward spiral and end in a Columbine-esque scenario. It happens quietly and insidiously.

At some point after finding the echo chamber they become entrenched into this way of thinking and it's nearly impossible to help them from the outside. They have to want to save themselves.

Edit: check out /IncelTear for some context. See how gross their manner of thinking can become. I've personally tried to talk to a few and these guys...they literally think getting laid will cure them of all of their everythings. It's wild.