The Jesus wrote...
You're generalizing. Basically anyone is susceptible to corruption in positions of power, but there are, in fact, some who wouldn't let it go to their head. There are also instances where some nations would be better off going through a period of time where there is a higher, more objective authority governing them. During a civil war, would it be better that one side has the majority of the power or that a mediator would be step in and take control until order is restored?
As if it would work so perfectly well. Lets take a U.N. Style government as a universal body of Authority of the planet.
First off, lets just get this out of the way: Large bodies of governments are ineffective and only increase inefficiency when the size of the governing body is increased.
When a conflict arises, which nation will have to fork over its troops to keep the peace? Why would Italy for example have to hand over troops to keep the peace in Somilia? Why would Venezuela have to hand over troops for peace keeping in the middle east?
Lets say Russia borrows money from the U.N. and doesn't repay its bill and eventually snubs its nose at the entire body? What will the U.N. do? Trade embargo? Russia is one of the top five Wheat and oil producers. So that would ruin entire economies or if Wheat is held back, notice those riots in Haiti and other countries about the price and availability of corn and related products? Think about how horrible it would be if a major wheat producer cut off the supply.
What if there is a conflict and the U.N. has to use military force in a war. Which nation will have to fork over the troops? America? Japan, China? France, Germany, etc, etc
Lets say the U.N. council passes some "global law" that various countries disagree with but, the "Global Senate" passed. What is going to happen? Diplomacy? We have seen how well the U.N. has done with its diplomacy.
Points against a "Global Government" The "Oil for food" scandal? Huge amounts of documented bribes and kickbacks, the untold number of bribes and such that haven't been been discovered. The child sex slave scandal
http://www.infowars.net/articles/january2007/030107UN_Sex.htm
The current U.N. is a prime example as how pathetic huge government is. Putting a single person in change will just turn the putrid, bloated sack of shit of the U.N. into the form of a single man.
Even if the president of the world was a good man the person that would follow him would be corrupt and if not him then soon the position will be corrupted and thus the world will be royally fucked.
Take for instance the United States Senate. Riddled with corruption and etc. So if they are willing to be corrupt then what is to keep the "senators" of a global government from becoming corrupt?
The concept of putting one person in charge of such power is two degrees away from pants on head retarded.