Mabye not right now, but in the near future it might be possible to clone just a specific organ. The organ would basically be kept in a tube untill it's ready to replace it's original. If this was possible, then I have no issues with it. Full human cloneing, on the other hand, has the potential for all kinds of problems.
Other points to consider:
Cloning wouldn't be perfect; in nature there are always imperfections in animal/plant assexual reproduction of cells. How much more would there be in a lab-grown clone of something? There would invariably be clones with genetic defects; what happens to those? And if the original dies and it's tissue is for some reason unusable, how would you make more? If you clone a clone, you'll only compound the imperfections.
"I'm not crazy, OK? I'm totally, completely sane.
Now if you'll excuse me, I need to go blow up this dead body."
Agent Washington, Red vs Blue
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