An important thing to remember in discussing the morality of animal experimentation is that science does not answer moral questions. What benefits (if any) that result from any kind of experiment (human or animal) do not in themselves show that some experiment is morally justified. That occurs only in conjunction with moral principles and moral reasons, and those aren’t determined by the science. Making arguments logically valid can make this clear because then it will be obvious that there’s a “leap” from some claim about benefits or scientific results to a, therefore, doing this is morally permissible. As stated, the conclusion does not yet follow.