Human cloning would not be good idea because the reproductive cloning is not yet a fool-proof method. It took 272 attempts before Dolly the sheep was produced. This means 272 embryos either failed to develop properly or were discarded as defective. Also in other cases there were a large percentage of the animals born showed a high degree of abnormality and died quickly or had to be euthanized. And those that have successfully cloned have showed many health problems and none have lived to a ripe old age so far. And also there is no way of predicting what the intelligence level and capabilities of a human clone would be. What would be the psychological and societal implications for it as an individual? What kind of a life or future would it have? Since we don't know, many people consider it unethical to go ahead and clone.