'Our ancestors were stupid barbarians!' Not really. It's really the people who believe that statement who are the stupid ones. Sure, sometimes we can't figure out what or how the old Egyptians, Romans or Aztecs did. But that's just due to our lack of understanding their ways.
Yes, they used different means, had different believes and may have thought in ways different than our own. But does that mean they were stupid? Of course not!
Look at these two examples:
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