1) Hitler was not an ethical vegetarian, and not even a vegetarian.
2) He also did not protect the rights of jews, so he was not consistent in protecting animal rights. (jews belong to the species Homo sapiens, who belong to the class of mammals, who belong to the kingdom of animals)
3) It is true that some other nazi's had some sympathies with non-human animal rights, but they were not consistent either.
4) Hitler was against the rape of Arian women. So some ideas of Hitler were good, and the fact that Hitler had those ideas is not evidence that those ideas are less reliable. Rape of Arian women is wrong, even if Hitler was right on this point.