Is there any sustainable large-scale system?

So, it seems that democracy has been shown to be incapable to surviving human greed. Socialism seems to work only with small isolated groups, where s no real choice. Large-scale experiments are unable to survive the rise of tyrants. Is there any system that can united large masses of persons and be truly sustainable, or is the nature of Man's heart truly such that he and his neighbor can never achieve a lasting collaboration??

Any time you give anybody power, they will abuse it. The best systems are all finite in duration, but the more free and democratic systems will last longer as a system than any tyranny. Which usually gets replaced by another just as or twice as bad

So be thankful for what we have now, even though it is not as good as we used to have. And who knows, we have the option to do better in the future

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Ally of Justice
Addoration for Great and Dear Leader 0bama
連邦政府軍のご協力により、君達の基地は、全てCATSがいただいた。

Why do you think democracy is incapable of surviving greed? There are far more democracies in the world today than there were 30 years ago.

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"First thing we do, let's kill all the bankers."
- From Henry VI, altered somewhat.

And more and more of them have become de facto oligarchies with massive debts that face economic, and then social, collapse