We are asked from the outset to come up with a flawless system, to guarantee that things will work this way and not that, without mishap or error. If learning to live had to be done this way, then our apprenticeship would never end. Nor would the child ever learn to walk, nor the youngster to ride a bicycle.
This is a classic gripe I have with people inquiring or criticizing communism with me. They ask me to provide a perfect answer for every question they have, and when they can think of holes in my replies, they ask more. If I refuse to keep playing this game, they point this out as proof of an obviously poor-thought system.