Humans are naturally known to be that cruel. A lot of medicine today was first tested on animals, and then on some human populations to study how it affects or doesn't affect them so that they can learn from their errors. A clone is, and is not, a good idea to me. A lot of people will want a clone just to enslave the clone so they could laze around and do nothing, while others may want a clone so they could have double their intelligence, experience and knowledge.