Armies are useless.
Soldiers professional killers and criminals, people trained to commit crimes.
And we teach men how to kill their fellows.
There are no humanity and civilization when, even today, seventy per cent of our resources is used to kill other men.
Moreover, one single world government would be exclusively "functional" and would work within a different context.
For example, the CEO of the postal service performs his/her tasks but has no power, as he/she does not need it.
What are the powers of the CEO of the railway company?
What are the powers of an airline manager?
They just fulfil their tasks.
One single government would be automatically functional.
Nowadays, no government can play this role, since the existence of other governments arouses fears among the population and urges it to increase the power of the relating leaders and grant them a greater support.
If there were no more wars, powerful men would be no more required, since power results from war.
As long as wars take place, power will never disappear, because they are mutually linked.
A "functional" world government would be efficient but deprived of any power, just like airlines as well as post and railway services.
Our world would be beautiful, we would ignore the name of our president or prime minister, since they would be our servants.
Conversely, now they are our masters and, in order to preserve their power, they create fear: Pakistan is going to go to war with India, therefore the Indian leaders need the maximum power.
China may attack us ...
In his autobiography, Adolf Hitler thus wrote: "If you want to preserve your power, spread fear among the people."
He is right; sometimes even crazy people may be right!