Cloning is unsuccessful. Cloning is unsafe. Cloning will produce damaged children, because the cells of an adult human have been exposed to environmental toxins for many years and have developed new mutations. Animal experiments are necessary to answer these questions. It would be unethical to proceed with human cloning until animal experiments have proved its safety.
Cloning is a denial of death.
So is having children in the usual way, at least in some cultures. In the Old Testament, which had no belief in an afterlife, one of the greatest blessings God could bestow was that one's descendants would live long upon the earth. The clone does not carry one's consciousness or soul into the future, only one's genes. Therefore it is hard to see how this is a greater denial of death than simply having children. It produces powerful negative emotions.