As I know it mitochondrial DNA has 13 genes for making the enzymes that are the energy for the cell and the rest are instructions for making RNA's. I don't really see how that can be a morality issue, all that the mitochondria do is run basic functions to run the cell. It has nothing to do with things like appearance and personality. Yes, its inherited but the only difference in person made from this unique combination should be the lack of a mutation that could cause the person suffering throughout their life. If I had a disease that was passed on by mitochondria I would do anything to not have to pass it on to my babies.