If you think, as I do, that the whole “all cops must go home at the end of their shift” mentality carries costs for society, consider that a variant of the same idea as applied to astronauts may well cause the costs of manned space exploration to skyrocket–if it hasn’t already. (I think it has — and no, Virgin Galactic doesn’t count — that’s space tourism, something else entirely).
Samizdata found a commenter with the right idea:
As long as the kind of people you need keep queuing up to become astronauts, reduce costs.
You’ll want to hit the link and read the whole thing; it’s short and to the point.