And what you’re proposing wouldn’t shrink the left. It would grow it, including among places where “we” thought we were prevailing.
They would need to concede (surrender and agree to our terms) or leave. If they didn’t then they would be exiled.
I’m thinking a couple of weeks of no new food supplies and turning off their water supply would be enough to get their attention. Maybe just one week if we stopped the water. If that didn’t work then we can always do it the conventional way.
As much as I don’t consider leftists American; they consider themselves American.
I dunno; in a perfect world we could snap our fingers and all the leftists would either disappear or be re-located to a communist or socialist hell hole of their choosing.