The reason why some people believe this to be an ethical problem, and others don't, is that the questions "What constitutes a human being?" and "When does a par

The reason why some people believe this to be an ethical problem, and others don't, is that the questions "What constitutes a human being?" and "When does a part of another Human body become a human being?" are hotly disputed. It's hard to say for certain what aspects of "humanity" is carried by mitochondria. So some will say that there are two mothers, others will say there is only one. Some will say this is unnatural or violates religious beliefs. In my opinion it's a wide leap to say some reproductive technique is evil just because the people writing holy texts didn't conceive of it a few centuries ago.