You want to adhere to a narrow nationalistic agenda - I.e each nation for itself - allow me to expand on this point, in an attempt to explain my position.
The nation state gives us stability, it puts a lid on tribalism and has allowed e.g. us Brits to advance culturally, economically and advance our technology and knowledge.
If us Brits never became a nation, we'd still be painting are faces blue and would be slaughtering each other. The nation state has all but stopped this, the exceptions being football violence and London gang stabbings. The latter is not helped by the current trend of multiculturalism which is fracturing our society.
In short, the nation state is the best arrangement we've come up with.
Of course each nation looks after itself but what I want is for nations to have mutually beneficial relationships and business deals.
If you think there is a better arrangement than the nation state, please describe and give an example.