Is that supposed to be an argument in favor of royalty? At best, it's about how other things people think OK and are used to from a young age are also messed up. One could use that line of logic to excuse all kind of societal issues at their time -- segregation, racism and sexism for example.
And yet, society evolved beyond those, from self principles like equality.
So? The US also wanted to do the same (build a society based on "certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness"). The French too during their revolution. As did countless other revolutions besides the "commies".
Didn't end that bad for most of them, in fact that's how the modern world was build.
Would you rather we still had Kings and Pharaohs lest "some people turn to be more equal than others"?
You could argue that for almost anything that we have in society (Religion and the State being the two most obvious ones). And yet, it intellectually doesn't phase people the slightest. "So what if we're taught that government is good and benevolent since a tender age". This is precisely because most of society does not function using first-principles. If they did, we'd be in a completely different world right now.