Is a world government necessary to protect the rights of nations?
In today's world, we see that whenever a nation starts opposing Western values too much, America destroys it and replaces its leadership with something else. The only counterexample I can think of is Saudi Arabia, because America has great financial interests not to replace Saudi Arabia's leadership. The end result is that all countries follow Western values to some degree.
Would it promote cultural diversity if there were a world government that would police the nations, and prevent a powerful nation from waging war with a weaker one?
Re: Is a world government necessary to protect the rights of nations?
Do weak people benefit from anarchy?
No. Weak people benefit from a good religion which strengthens them. And this ultimately results in good government. This is what happened with the Reformation that ultimately produced the American Constitution.