Adolf Hitler himself was a vegetarian, and much of his inner circle was composed of people who abhorred animal experimentation and other practices. How did the Nazis reconcile such views with their willingness to disregard the rights and safety of other humans?
So there is always more to be said here, but I would point to a few previous responses of interest to this topic:
This thread with responses from myself and /u/kieslowskifan on Nazis and Animals.
This thread with Kies talking about Nazis and "Environmentalism".