BKM - You are right we should leave Korea, Germany, Italy, England, Okinawa, and all the other 50 or so places where we have US troops when the freely elected government there asks us to go. No question about that. We should not go every time a rabble of protestors burns down a neighborhood. We should also tell these counties that their defense is now their own responsibility and all treaties are up for renegotiation. We should be polite guests, as we currently are all over the world.
A Reminder: Countless people are alive and free because of Realpolitik. Far more than would be under communist control.