But the logic is good. The more healthy people helping the sick, the more sick people survive.
You should read this speech by a Canadian radio broadcaster in 1973. Americans are good people.
We had other nations send aid to us to help with the Katrina hurricane disaster. The only one I remember for sure was Kuwait, but I believe there were many others.
But of all the expressions of aid and sympathy, the one that moved me most profoundly was when the Queen of England had her band play the Star Spangled Banner after 9/11.
To this day, I am deeply grateful for that gesture of support from Her Magesty.