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someguyfromcanada  ·  2850 days ago  ·  link  ·    ·  parent  ·  post: Free Speech and the Paradox of Tolerance

Fair point. Just because something has not happened does not necessarily mean it won't.

At the same time, some things that have never happened will also never happen.

But saying "I can not foresee an advancement in technology" is very different than "I can not foresee everyone agreeing with the same subjective values". Slavery is one such subjective value that was never, is still not and may never be universally agreed upon.