The reason I raised the issue of rights is because many (though not all) of the people who oppose vivisection do so on the premise of "animal rights"; which I think is a false premise for the reasons I outlined. You can see a similar line of argument used, among other things, to justify the banning of hunting.
People who call in the Holocaust to back their position are usually erecting a "straw man". Anybody could see that experimenting on animals for medical research is completely different to gassing the Jews/Poles/Gypsies/homosexuals; because the latter has the capacity to reason, create culture and differentiate between right and wrong.