Agreed.
America has a high "breakup value". In a doomsday scenario, the country would be reorganized into two nations, just as is being proposed for Israel. Leftists might migrate to a nation of settlements in the Northeast, with all the corruption and squalor of Cold War East Berlin. The rest of America then would be liberated to flourish in freedom and prosperityLeftism is a process, not a steady state. Every state has its discontents and that vents into left wing movements. Done right leftism acts as a pressure relief valve, letting unhappy members of society vent and become more productive.
Getting rid of the liberals will only help in the short run. Until you figure out what the causes of liberalism are, you'll always have liberals.