Comparing animal cruelty with what is pretty widely seen as one of the single most horrific things humans have ever done to each other serves to
weaken your argument for people that don't already agree with you, not strengthen it.
I know comparisons are a tempting tool, since they're a very effective way of communicating a lot of information and, more importantly, an impression very economically. But part of what made the holocaust so horrible is that people were being treated like animals. It's like trying to argue that dogs should be kept inside by saying "What if you made your toddler sleep outside in a dog house?", it's a comparison that defeats itself.
If your goal is to feel righteous on the internet and demonstrate your strong love for animals, by all means proceed. If your goal is to change hearts and minds, reconsider your rhetoric; you'll have much more luck if you tune it to people that don't already agree with you,