i think sometimes its based on what you know makes it acceptable. sometimes its based on what information is all around you that makes it acceptable. and sometimes its your peers or the group you commonly listen or speak to that makes it acceptable. sometimes its your experience and ability or limitation there of that makes it seem right. Its very rare to find people who want to know why and dive deep with an open mind compared to people who always want to seem right.
Discussion
I think what you describe is the strong influence of recency bias on individuals and the survival instinct to not stand out in a herd lest they be single out by the lion.
maybe, maybe its all they've known their entire life. Maybe they never had to fight to survive, to live, to be free. Maybe they never had to figure shit out on their own. Maybe they were spoon fed all their life. Maybe there are all kinds of people from all parts of the world with diff exposure and experiences. Maybe there's limited knowledge, maybe they are willing to know more. But boxing people into a definition is definitely not what I'm describing, nor would I be for it.