The issue is that you still haven't explained what you mean by reasonable. As I've shown above, making up arbitrary borders and saying that it is only reasonable to help the people within one, is not reasonable because one can make up other arbitrary borders until Kingdom come. Even within your country the rich may build walled houses and ask why they should help the poor people who live outside the walls of their house. This happens every day and you still don't see that this wouldn't somehow magically not be so if you just had a glorious nation state.
Why do you think tax evasion exists? Because your fellow British nationals who are rich are so much more eager to help your homeless and unemployed than the EU bureaucrats? What is the major reason tax evasion is possible? The existence of other nation states and the non-cooperation between them.
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