Here's the problem I am having, I guess. I am trying to figure out the smallpox story if we try to rewrite it using your filter.
I'm glad you acknowledged the concept of statistical lives. It was driving me bonkers. The scare quote you used earlier was a great way to mock the concept. There are so many things we do that require thinking statistically: cleaning up nuclear radiation, preventing greenhouse gas excesses, vaccinations, anti-smoking campaigns, etc. You can never show that you saved an individual life, but you can show that you saved lives.
I acknowledge the concept that acting at distance is easier to screw up. But it's balanced by the fact that it's also potentially so much cheaper. Like it or not, we're about to beat polio. I think it's a good thing. Advocating that we stop, when we're just about to beat it, seems to be the wrong tack.
I think we're just arguing definitionally about donating to live-saving research. To me, "charity" is retasking some of your wealth in order to benefit others, and the "charity" is diminished by how much that retasking comes back to benefit you. It's a gradient. Donating a kidney to a stranger would be a type of charity. Donating to a friend would be as well, but kinda 'less so'.