Our status as a social species that works better when it works together and looks out for other members of the group.
Refusing to contribute to a country's social programs and welfare is basically giving the middle finger to everybody who is less fortunate than yourself. Fuck you, got mine.
How charitable and humanitarian.
We have a much healthier and more productive society when we aren't entirely focused on material self-interest and and irrational fear of strangers or 'welfare scroungers'.