George Kateb at
Cato Unbound makes a libertarian case
against patriotism, concluding:
If no one were a patriot, the world would be better off than it now is, when almost all are patriots. Theorists shouldn’t join in.
Kateb's anti-patriotism is similar to, and effectively amounts to, pacifism, and bears that doctrine's fatal flaw; it doesn't work unless everybody embraces it, which won't happen anytime soon, if ever. Patriotism can be a spur to aggression, and also the only safeguard against aggression. A country with some degree of freedom but no patriotism won't have that freedom very long.