That would be valid if it had really been shown to happen the way you describe, it hasn't.
Warlords fighting over political authority is not a proof for what happens when the entire society rejects the concept of political authority and refuses to accept it as valid. Political aspirants wage war for political authority only because it has value. The point you raise is so common that it actually has a parody term; Argumentum ad somalia.
Now I grant that this still does not mean we are right, but this is no "provably effective" rebuttal, either.
Warlords fighting over political authority is not a proof for what happens when the entire society rejects the concept of political authority and refuses to accept it as valid. Political aspirants wage war for political authority only because it has value. The point you raise is so common that it actually has a parody term; Argumentum ad somalia.
Now I grant that this still does not mean we are right, but this is no "provably effective" rebuttal, either.