But at the pace we, humans, get access to education in order to understand the basic concepts you refer to, we may lack time.
The planetary government you are calling for has a clone that many are feeding. It’s called economic globalization and runned by the huge transnational companies with the direct effect of making the rich richer and the poor poorer.
So, take a deep breath and accept the fact that it is sometime wise to step back and reintroduce the values of outdated methods like borders, nationalism, protectionism, proximity preference and all these things that you would like to bannish.
Step back in order to make the big jump when the time will be right.