Here's the thing, this is essentially the same debate as communism. You are totally right, and it would be great if things could work that way, and IF humans WERE perfect then we could probably pull that dream world off. Unfortunately, I think you are putting way to much faith in how far human conciseness has come; it just simply would not work right now, we are to corrupt.
Also earlier you mentioned "culture" being stupid or something, and the Middle East being a "shit-hole" This is where you make your own argument break down, you aren't even ready to accept other people for being different(and no matter what, people in different areas always will be). How do you think ALL humanity would act if all of a sudden we were under one government, or governed ourselves. It doesn't work, sorry dude. I honestly REALLY wish that it could work, but...get real.