I think it's pretty easy to understand why. When somebody is very ill, they think their illness is the most important thing in the world, and it certainly is to them. But to a doctor, they're just one of the thousands of patients, all of whom think the same thing, that they've seen that year.

And everybody thinks that with perfect medical treatment, they'd be healed, when in reality that isn't the case. Some conditions are simply terminal and the best treatment in the world isn't going to change that. And you even have the equal but opposite happen on occasion. For instance cancer sometimes spontaneously goes into remission even without any treatment, which is going to lead to a rather great outcome regardless of how inappropriate (or nonexistent) the care may have been. Had this happened to Steve Jobs, we could've seen a catastrophic social cascade begin.

Doctors are going to see those odds and outcomes play out, day in, day out.