This is a tricky subject, and you have touched on a nerve, in that medical advances have been made through animal experimentation. I am not naive enough to think that that is not the case. Of course, there have been very bad red herrings (like Thalidomide), because the results seen in animals do not necessarily transfer to humans, so it is a risky business. However, the question is whether or not we have a right to do this. We are basing our right to do this on the assumption that we have the absolute right to inflict unlimited suffering on animals, based on the fact that they are not human, as opposed to based on their capacity for suffering. This I contest. I think that animal experimentation has proven to be a door to medical discovery, which was opened in the time of Descartes, when the belief was that animals did not have pineal glands, and they could not really feel pain, which has remained open, because people were reluctant to shut it, even though the foundation upon which it was based was utter hogwash. We rightly condemn experimentation on humans, although it probably would provide much more accurate pointers in medical research, based on its inhumanity. I have confidence that we as humans, in the same spirit, can turn our backs on the inhumanity of experimenting on animals, and devote our energies to finding other solutions.