Let’s give it a trial run and see how it goes.
Let the blue areas have all the illegals, crime, riots, discordance and poor governance.
They’ll be screaming to re-join red areas within weeks.
I am all for somehow concentrating the blue population into a few locations (NYC, Chicongo, LA, etc) and work to make them totally dependent on external supply lines. When those blue areas get uppity, surround them militarily, cut off their food, water and power until they see the error of their ways.