I get your point, but I seem to fail to make mine clear.

Slavery was never ok, people were ignorant of that truth, period.

Who knows, a thousand years from now everyone might think that we were monsters in the 21st century, because we ate animals.

What you describe when you say relativism, is the parallel conversation that justifies regressive ideologies in the name of tolerance. The stoning of homosexuals for example by Islamic nations. Nobody in their right mind should tolerate barbarism.

I'm mostly referring to the constant shift in social norms that affect our moral glass minutely every generation.

Here's another example of recent times. In my grandpa's generation, women would get married commonly at 16 years old and start having children right away. Today, we would say that a couple who's still in their teens has no business getting married.

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