Even if you were to abolish the national governments you would still need a local government that can always be at odds with the central government, right?
But if you abolish these local governments as well, then you're basically imposing central diktats on a population, correct?
Kind of correct. E.g. you may eliminate national parliaments and have only EU parliament. Yes, it has problems, but it feels something like that will happen eventually in EU. I am OK that this happens slowly.