An experience shared by many is that people in general tend to accept only what they already know or have experience of. A complicating factor is that people want a commonality of knowledge or experience, for this commonality makes them feel safe. They do not want to stand out. People who do, tend to be ostracized. Listen to conversations at dinner tables and even speeches in congresses. One would expect people to dare address the new in those places but only minor deviations are deemed acceptable and these are then only addressed in a facetious way or, as in scientific circles, as a posited reason, phenomenon, or explanation, in other words, as a suggestion or proposition, not as a fact.
The low acceptance level of people stems from