I think people get stem cell research and full blown cloning confused. I am all for stem cell research. After a human egg has been fertilized with sperm, it goes through a period of four days of 'plurapability'. This means the cells can then be manipulated into any kind of tissue that the body has: muscle, bone, organs, etc. After the four day period, the cells began to form into the tissues of the respective body parts. It is not until a period later then this that an embryo is formed.
Anyone read the 'Robots and Empire' series from Issac Asimov? There were a type of people in the books called Spacers, bred humans with average life spans of 400 years. This helped the Spacers explore space without dying of old age just traveling to a specific destination. Future use for cloning humans, mayhap?
Think of this: there is always an underground. IF a government is going to balk over an action, some underground movement sure as hell will not. Think of the biological warfare possibilities of developing a super soldier, like Captain America. Hhmmmm