well, since stem cells can be cloned or artificially grown, and or taken from umbilical cord blood, no baby or future baby or clump of embryonic cells need to be "harvested" in order to produce stem cells.
Anyone who is against stem cell research ought to be locked up as being a danger to society. For that matter they should be against all other forms of medical research including searching for a cure for cancer and all other diseases. If they're against stem cell research on moral grounds.....
I for one am all for pre-screening of couples who want to have kids to determine if their offspring will be susceptible to all sorts of diseases.......or birth defects. I cite the example I used a while ago of the couple who knew they both carried the gene that would produce a child with (can't remember the horrible disease/defect) and knew the odds were something like 80/20 that the child would be born with this disease and would require millions of dollars of constant medical treatment in order to simply exist, and in no way "live". They went ahead anyways despite the warnings and sure enough, the child was born and sure enough, would cost millions to keep alive.