i think we can learn from fringe political groups in this regard. you know, crypto-fascism, crypto-communism, etc... the kind of ideology that usually gets dismissed out of hand, but can still push the narrative in one way or another by masquerading as something else.
although i'd like to make the fandom a place where people can be openly zoo, that's more of a long-term goal. at the moment, respectable, mainstream furries more or less feel like it's okay to hunt us down and dox us, and to shame people for enjoying feral art. but most of these people are secretly self-conscious about their own taboo fantasies, so explore that angle: why is all the rape and murder porn okay? what are you hiding? and why does it matter if the cartoon dogs we jack off to have four legs instead of two? even though feral art is basically just zoophilia, i'd like to push the notion that it's totally different, so that people let their guard down and look at it without shame or remorse, because it's one step closer to real zoo content.
furthermore, if you know anyone who might be convinced to support us, then you can carefully start to breach the subject. particularly if they already like feral porn. i start testing the water by making jokes. if they react negatively, you can reason that it was just a stupid joke and diffuse the situation. when i finally feel comfortable to make my pro-zoo arguments, i pick my examples carefully. for example, a dog mounting a human — because it's very hard to argue that the human is coercing the dog in this case. or a man and a mare, because a horse can really mess you up if she feels endangered. but before you argue about this at all, you have to have a good pretense for doing so, so that you they don't think you're just arguing about it because you want to fuck animals. i usually reason that it's a waste of the court's time, or that we shouldn't infantilize animals and accepting their sexual desires is a major part of that.