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

> ...and whoever says, You cursed fool! [You empty-headed **idiot**!] shall
> be liable to and unable to escape the hell (Gehenna) of fire.
> [Matthew 5:22 (Amplified Bible)][1]

 - Is this a point lost in translation? 
 - What point was Jesus making when he said this?