Why is the left determined to use embryos? I suspect there is a market for fetal tissue, anybody know what Planned Parenthood does with it? I sent them an email asking, never got a reply.
The answer should be obvious. The "stem cell debate" is just the latest flag of convenience being used to dupe the public into believing that some good will result from evil. By cleverly phrasing the debate as "embryonic" vs. "adult" the debate is steered into the familiar landscape of "choice". The pro-life movement falls into the trap when they argue for "adult" stem cells.
The real argument (for which the left has no response) is to phrase things as "natural" (autologous) vs. "artificial" (foreign tissue) cells.
There really is such a thing as "natural law". This is but one aspect of it.