How do people in this day in age become nazis/neonazies sexist or even incels when there is so much knowledge against it? Do they get anything out of being that way?
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).
Its weird that you mention a need to be right. As a nurse we are taught to question everything and anything but when it comes to doctors we are suppose to keep our mouth shut. I took a semester on drug abuse and signs as an elective and you would be surprised on how many doctors who operate or diagnose patient look and act or exhbit the behavior of a drug addict.
Yeah, that's the thing: the things commonly associated with logic and careful thinking such as Formal Education (even in STEM domains) or Intelligence are no defense against one's emotional needs, wants and fears.
As I've said more than once: no matter how Intelligent a person is, their Subconscious is just as Intelligent and hence just as capable of subverting the their Conscious mind.