"We would risk having a global Hitler / dictator that's what is wrong with it. "
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Why does a one-world government have to equate to a global Hitler? We could have one-world elections.
Dont be afraid of the pyramid management structure... it exists in our families, business, army, government, clubs, etc.
As for free thinking. Thats a laugh. Its only been less than a hundred years in which western women could even vote. Homosexuals cant get married now. I cant say what I feel to my CEO without getting the arse. Etc.