Nuclear weapons would be the primary reason for no WW3.
We're discussing the UN, not nuclear weapons. The UN can do a lot to prevent war, more if it's strengthened and improved.
Some might say 'what do you want, one world government?' and I say no, a stronger UN is how to preserve what the world needs, diverse political power - it's the national model that leads to 'one world government', where one country or group of countries eventually establishes global dominance - likely with most other countries forced to serve them, and no shortage of tyranny, permanently.
Imagine the 'economic elites' globally from China to the US and elsewhere forming an alliance for their own interests. Oh, wait, you don't have to imagine a lot, as the tyrants of China and the world's largest corporation, based in the US, have gotten pretty cozy in the early stages of such a 'partnership'. How much do you see the US government really pushing on human rights in a place like China, compared to a place that's an 'enemy'?
In Africa, UN backed a "president's" supporters are slaughtering innocents under the watch of UN Peacekeepers:
http://www.huffingtonpost.com/2011/04/02/ivory-coast-massacre-1000-killed-duekoue_n_844000.html
Shocking, the UN is made very weak by its critics, who then say "look, they weren't terribly effective somewhere". How would that slaughter have gone with NO UN?
The UN peacekeeping does a lot of good. It could do more. It does a lot of other helpful things as well, especially against poverty.
Yet, their citizens were smart enough to join the precursor to the United Nations, the League of Nations.
Actually, Japan and Germany left the League of Nations - which the US never joined - in 1933. Less international peace organization went well soon after.
If only the enlightened were allowed to govern, pesky universal suffrage.
You ironically make my point.
The UN is the police and not America? Great, that means that we can cut our defense budget big time and pull out of shit hole "countries" and let the UN Peacekeepers deal with it and other nations pay for it.
You missed the point, also shocking. But yes, we can cut our defense budgets, and the UN being able to do more would largely work out better than our largely phony 'coalitions'.
They not only have the obviously bribed members - 'sure, Whateverstan in Eastern Europe will put their name on the list to attack someone thousands of miles away for a price'.
Even our closest ally Great Britain is right now doing an evaluation of their relationship with the US as one in which 'they are expected to act like our poodle'.
A broader based agenda for the planet might do well to help set the global use of force. The UN was not planning war with Iraq; they did approve the limited war in Libya.
The main thing that has changed is that our governments (The West, Russia, Japan, etc.) do not do the dirty work anymore. The governments of select countries basically enslave their own people for the benefit of their ruling parties. Each time you buy an Apple product, clothing, etc. made by de facto slave labor in another country, you contribute to this "problem." It provides you with lower prices (raises your standard of living) and you do not have to see the working conditions that women and children slave away in their entire lives because it is all overseas and out of sight. It is not our troops that are getting killed when the protests / revolts start, the governments of these countries slaughter their own people to maintain power. I am not saying it is right, as a matter of fact, it is a terrible situation. I am saying that many of the ills traditionally ascribed to imperialism still exist in the world, they are just no longer caused by imperialism.
http://forums.anandtech.com/showthread.php?t=2143681
I pretty much agree - I almost could have written the same thing, and almost had made a similar comment. Economic superiority/tyranny has evolved, but it's still there.
Regarding an exit from the UN, that would be silly. We have a permanent seat on the security council and can foil whatever silliness comes our way with a veto.
Which misses the point about the issues for the UN - it's a selfish comment. There are other issues, such as having more global cooperation and democracy, or less.