I don't think people are opposed to stem cell research because it's "playing God", they are opposed to it because it involves essentially creating an embryo to harvest cells from and when they are done with it, they kill it. I don't think there is much opposition to non-embryonic stem cell research.
If they use embryos that were already created for other purposes, would that be ok? There are many embryos sitting in liquid nitrogen right now that are left over from human in vitro fertilizations that will never be implanted. Do we keep them on liquid nitrogen for eternity?
Cloning is a difficult one, the morality of it isn't clear, but I am not sure what benefit it brings at all to the human race.
Clones are found all over nature. Identical twins are clones. The potatoes you eat are clones. Aspen trees are clones. Of course, it begs the question of what the real boundary is between artificial and natural.
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