Wexter said:
Is this even a serious question? How about the same reason we haven't yet cloned a human being? Because it doesn't seem right. Basically the Clone Wars were about Republic pitting their artificially manufactured disposable human beings against the armies of disposable machines. And everyone was so degenerated that it didn't even strike them as a moral dilemma. Now if "Clone Wars" (which was established as soon as Episode IV) was in fact about this dilemma - and the bad guys would be in favor of such policy - that would make an interesting conflict.

I think you're missing the forest but hitting the trees. Doesn't it mean something that the morality is scarcely ever discussed? Nobody seems to terribly mind the loss of life. The absence of that concern for life manufactured to kill and/or die is what morally indicts the Republic and the Jedi.