Well I find this question interesting, let me see if I can pharse my thoughts intelligently...
1. If the nature of the experiments is for the pure expansion of human knowledge, I feel that there scientific organizations and insitutions should conduct additional experiments. We advance ourselves by excreasing our understanding of the environment that surrounds us. It would be detrimental not to pursue a full understanding of cloning and its related applications.
2. Personally, I have no problem with the underlying principles of cloning. Although in the past many people have often spoken out regarding certain 'forbidden' techologies or subjects that mankind should not pursue, I do not think cloning is something we should collectively fear. However, using cloning as a means to overcome certain medical problems we face today (using clones as farms to grow organs suitable for transplant) would have an negative impact on the field of medicine. While some would argue the ethical and moral implications of exploting clones for befit of 'naturally-born' humans, I believe using clones for the harvesting of organs would have a negative impact on the field of medicine as it would most likely retard efforts aimed at curing disease as a reserve of readily availible donor organs would always be at hand. Even though it can be argued that having completely compatiable sets of donor organs availible in major metropolitain areas would save the lives of those needing donor organs... I feel that finding a permenent cure would be best
3. Of course not. 'Nature' is as we choose to define it. Nature is a creation of the combined qualities of all the lifeforms at inhabit it. We, humans, as holding the highest postion amoung animals and plants play a major role in shaping our surrounding environment. If you look at samples of single cell organisms who multiply by cell division, producing two identical copies of themselves, you could argue that they practicing a form of cloning.
In any case, I believe that cloning is simply another expansion of human knowledge. While this knowledge could possibily be used to an evil purpose (which I believe could not be sustained for any long term period), the positive effects that we as a species have to gain from expanding research into the field of cloning is immense.
4. Yes, I believe I would. Allowing of course that the government is not collecting samples of citizen DNA to organize a plot to control our thoughts, emotions, and actions... j/k.