They should seriously have their own place where they can live the dream. California would be good. Let CA, WA, and OR break away and become the Leftist States of America. Let all the liberals in the country who don't want to live in the USA anymore move there. If they need more land, we could consider throwing in Nevada.
Thing is, if a move so bold was actually made, those 4 states would devolve into chaos, and their citizens would flee to the USA and attempt to recreate the hellhole right here.
Leftism is a virus, and the only real cure is extermination.