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Ok - but this is a call for gun prohibition, which a lot of people keep saying nobody is calling for.

Literally no one here is calling for "prohibition". You inserted that term into the discussion yourself.

> The conversion of the British gas supply to North Sea gas

There was a complete prohibition on CO containing gas. Go read the story again.

The term describes what is being discussed when people are reasoning by analogy with other things which have been eliminated from use.