No Stupid Questions

If you remember the post trump election memes about economic anxiety being mediaspeak for racism, this is basically where that came from.

Bigotry is a despair response, when the promises of normalcy fail someone, there's a chance for them to start looking for new meaning to understand a seemingly indifferent world, and in that state of mind, being told you're part of an exclusive club of inherent superiority is the ego stroke that gets them off.

From the moment they take that poison pill it basically plays out as an analogue of addiction. Even as they watch the sludge they're mainlining destroy everything around them it doesn't cut them off from, they just can't stop, because the validation of feeling that it's the entire world that's wrong instead of just you being shit out of luck is too much for a lot of folks to be willing to part with.

It also doesn't help that these people tend to get fired from jobs that don't put up with racist bullshit, turning the whole validation needing into a vicious cycle sort of deal.

This is also why some very stupid self described leftists seem to have zero worry about the rise of fascism (even as they insist that they're the only ones who truly take it seriously as a threat), they think "just do a socialism bro" will instantly fix everything as if economic hardship would never happen to a socialist society even within a vacuum.

They literally think you can just pay the racists to stop being racists, and that you can pay a heroin addict to stop shooting up.

Echo chambers which most social media apps and websites really love to create

Incels are the easiest to understand. Some people are just unattractive.

Disenfranchisement is a hell of a drug. A lot don’t believe in the ideology at first, but are forced into it because they lacked proper role models when they were young.

Low on Kohlberg

People don't actually guide themselves by Logic.

In fact they undermine their own logical thinking abilities, especially by seeking only that information which confirms that which they already believe in (because it makes them feel to good to "be right") and avoid or deny that information which disproves that which they believe in (because it makes them feel bad to "be wrong").

Even very intelligent people will reach the dumbest of conclusions because of how their own emotions control the inputs to their thinking, the kind of things they think about and even which conclusions they immediately accept without challenge and which they actively try and disprove.

Also add to this that only a small number of people are familiar with the practices of Analytical Thinking (such as used in Science) so are prone to falling for all manner of fallacies and observer cognitive errors (stuff like how one spots mostly that which happens, not the absence of things that should be happening, how others react to one's own non-verbal cues and shape their responses to one's expectations and other such things affecting what one observes and which led to things like Science have double-blind experiments).

Their evidence isn't your evidence. Your curation of facts are never the same as anyone else's. How you interpret these facts are reinforced by your family or friends. If you don't have either you find community where you can. Rinse. Wash. Repeat.

This is the same for many communities. Where a person finds themselves isn't necessarily malicious. They are protecting what they value and think is what makes them unique. That is what makes them dangerous. It's all they have.

Some people have problems in their life and it is convenient to believe they are do to an outgroup. You mention knowledge against it but these people live their lives and insert their instilled prejudices to explain the flaws, making them have (fake) first hand proof of their beliefs.