//I can’t think of another way. A world without countries and borders would still require a social structure, laws, educational facilities, health facilities, social welfare, etc., and a central body to make decisions and to administer all that in such a manner as to satisfy all regardless of cultural peculiarities. Personally, I think it’s an idealistic notion and as such completely unworkable….//
Indeed. Mankind has evolved in different areas of the globe and has developed different cultures, habits and lifestyles. Very often they are incompatible with each other. History is littered with the creation of enforced empires with centralised administrations where virtually everybody gets what nobody wants. They have all failed because of these incompatibilities. You don’t actually have to look too far back. Just consider the USSR. The EU will similarly fail eventually for the same reason.
//the widespread view that 'we are right' simply because it's us and 'no one better tell us (or attempt to show us where) we're wrong'.//
That isn’t the widespread view at all. The view of most people that I know is that the country they were born and bred in is where they feel most comfortable. They understand the rules and the limitations and they tailor their ambitions and expectations accordingly. It’s nothing to do with being right or wrong, better or worse.
Anyway, enough philosophy, I'm going up the pub. Oh! Hang on....