Most forms of large, centralized government have shown to be destructive in practice. They might start out with the best of intentions, but they are too difficult to repair once corrupted and divorced from representation of the interests of the people. Preventing that corruption, when the spoils for attaining it are so great, is virtually impossible.
Nobody wants to talk about that, though. Blame modern capitalism, communism, monarchy, or whatever else is currently en vogue, but let's ignore the elephant in the room of the one thing that all of these systems have in common.