If they all united into one world government, under a democratic rule, remove money from politics, abolish all victimless crimes without exception, ban all weapons, introduce a massive and very expensive scientific and technological effort to fight climate change and preserve the environment, and start measuring its own effectiveness by the reported well-being of the world citizens, rather than economic indicators. Then I don’t see why not. I love humanity, we are wonderful animals. Stupid, yes, but it’s curable. ;)