People become lonely, disaffected, and negative towards the world they live in. They then reach out to other communities, and due to one thing, or another, primarily their personality, they don’t get accepted. However, communities based around hate will gladly take them in, as long as they fit a profile they are looking for.

"Are you a young, white, male, that is dissatisfied with their life, and the world? Well, we accept you here. These things are not your fault, it is the fault of others. You aren’t the reason you cannot get a relationship with a women, it is the women who are fault for this. The reason it is so hard to get a good paying job? Immigrants. Why is housing so expensive, and hard to get, at least anywhere with a large enough job market to really advance somewhere? The Jews. Why can’t you rise on the corporate ladder where you work? Progressive policies… also jews, and immigrants. You are a white man, you should be rightfully at the top of the hierarchy. Women should be given, by their fathers, to men, on a mutually beneficial, transactional, basis. Women should submit to your authority. "

Or, in the case of incels “Are you depressed? Have no friends? No social life? No relationship with a woman? Are you an adult virgin, loser? Well that is because women are evil. We will accept you, unlike the evil female species.”