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Any sufficient large number of people will behave idiotically (from lat. idiota, ignorant)

• triangleman 6y ago
  The Latin idiota is borrowed from Greek ἰδιώτης idiōtēs which is from ἴδιος idios meaning "private" or "peculiar". Idiot has historically meant "retarded" so if you wanted to say "ignorantly" you could have just said that, or "idiotically" is fine but don't pretend it has such wholesome roots.