Well, but even in the capitalist hellscape of America where we get blatantly overcharged for healthcare, we still largely use a mix of private and public insurance. Even if I didn't care about other people or want them to have long and healthy lives for its own sake, I would still want want them to be healthy because my insurance rate is tied to the overall cost of healthcare, which is higher thanks to people being unhealthy. This is an insane way of thinking, and I want everyone to be healthy for the intrinsic benefits, but even if I were to be completely selfish, well, they're costing me money.