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How does calling someone an “idiot” make one subject for gehenna?

How does calling someone an "idiot" make one subject for gehenna? I'm sure there is something of translation, meaning, or ancient culture to be considered here.

Matthew 5:22

...and whoever says, You [d]cursed fool! [You empty-headed idiot!] shall be [e]liable to and unable to escape the hell (Gehenna) of fire.

  • Is this a point lost in translation?
  • What is the point Jesus is making when he said this?