While you do provide a very strong argument, I don't really understand what you said about choosing certain traits and saving the life of someone with both a genetic disease and a clone.

To my knowledge, cloning is done by extracting the nucleus from a cell of who or what you want to clone, remove the nucleus of an egg cell, put in the first nucleus into the egg cell, and have it grow naturally in a uterus.

This would not allow certain traits to be chosen, because the whole nucleus is extracted. And if the person who is cloned has a genetic disease, then the clone would also have that disease, so I don't see how the clone could help the person cloned.