If you kill them, you kill them: early or not. But you do not increase the number of deaths
Let’s make it easy. If you cure cancer there will not be less deaths in the long term. In fact, there would be a point in the future where there would be more deaths in a year than there would be otherwise.
Whether it’s the right or or the left, phrasing arguments in terms of how many “additional deaths” there will be is an appeal to emotion. In the long term, the number of deaths is equal to the number of people born. What we need to look at instead is the years of life lost, especially the years in which people are well enough to enjoy life.
What brought this on is listening to a radio talk show host saying that over the last few decades there were 35,000 additional deaths as a result of a certain policy.