Prejudice is built into the human psyche by circumstances, upbringing and education. As a result, we perceive to be true a variety of things that our own society is accustomed to credit or accept, and find it very hard to grasp that other societies have different belief systems. We tend to project our own attitudes, including value systems, on to strangers with different backgrounds, and assume they are perversely rejecting the obvious, when all they are really doing is looking at the world the way they were brought up to look at it.
To doubt the necessary truth or justice of one or more of your society’s accepted norms, requires considerable mental agility and effort. In many societies, it also demands courage, since dissent is harshly discouraged by those who derive power, or simply mental comfort, from the status quo.
The road to enlightenment starts with asking the right questions. A great many people won’t get this far.
Learning proceeds through enquiry, exploration, investigation and logical analysis. It is here that you encounter fallacies. Fallacies are logical errors, or mistakes in the reasoning process. Many people who get as far as the reasoning process will get no further because their reasoning is insufficiently rigorous. However, they may well persuade themselves, and others who are uncritical, that they have the answers they sought.
In the modern world, many believe in cancelling, or abusing rather than reasoning. They shut themselves up in echo chambers of like-minded individuals and won’t hear contrary views. As a result, when challenged by a rational objection, they cannot answer rationally. Being convinced of their own rightness, they have allowed their reasoning faculty to atrophy. They often resort to doubling down on their cancelling.
If you know what you are looking and listening for, you will find throughout any popular discussion forum, from Quora to the local pub, examples of the pathetic fallacy, affirmation of the consequent, argumentum ad misericordiam, straw man fallacy, correlation / causation confusion, ad hominem fallacy, appeals to authority, false dichotomy, and, of course, at least where I live, the eternally popular “No true Scotsman” fallacy.
All of them tend to generate more heat than light, which is why I was always taught that the first person to lose his temper loses the argument.