Comment by WJW

Perhaps but you while you can maybe predict where the rocket will fall, you cannot reliably predict who it might kill if it hits. People move around and even if you can see it will hit a house for the elderly, you cannot see how many (grand)children are currently visiting. Also the opposite is true: a rocket hitting a child care facility would cause double the economic damage. That is why I used an average in my previous post.

In any case, elderly and disabled are not as useless to the economy as you might suppose. There are many disabled who are economically productive. One of the most capable colleagues I've ever had was a blind programmer. Grandparents often provide things like babysitter services that don't show up in formal GDP measurements but are very valuable nonetheless. Don't count out the contribution of people to society just because they don't have a normal job.