I disagree with every syllable, word, vowel, consonant, and dangling participle of the original post.
Humans leaders have, by and large, proven to be too inherently greedy, corrupt, and self-serving for an all-powerful 'world government' to ever work.
a. The voters of each nation should be free to decide the course of their own sovereign nations. And so on down to the States, parishes, and provinces.
There is not, and never will be, a one-size-fits-all solution to the world's problems.
b. The further away any government's leaders are away from the voters and tax-paying citizens, the more those 'leaders' become detached from reality and the will of the people.
No, good and dear original poster, you are wrong on this one.
Very much wrong.