I'd still go with my usual response. Which is the same response I give to any subject like zoo, trans, bi, gay, lesbian, drugs, and a whole host of other shit that falls under the umbrella of "if it isn't hurting anyone or anything (including critters), then I have no concern over what happens in the privacy of someone's home".
The zoo subject (as well as many other topics) has come up before in conversation with friends and such, and I always say the same thing. "I don't care, if nobody or nothing was hurt, then I don't care, and it's none of my business".
If they go on about it being "animal abuse", I simply say "Is it? Did you interview the critter?" And then go on to tell the story of my GSD jumping up on the bed while me and the wife were getting freaky and him thinking he was going to (quite literally and pun intended) insert himself into the situation.
It kinda catches people off guard, but neither myself or my wife invited him, and I just go on to say that the moral of that story is that I have personally witnessed an animal that has had no prior sexual contact with dogs or humans, initiate sexual conduct with a human with zero intentional influence to do so. He had clearly made up his own mind, and should he have been allowed to continue (he wasn't), could not have been "abuse" since it was what he clearly wanted.
And so no... I don't have any concerns unless there actually was harm done.
If people still don't want to take that answer, I follow up with "I don't want to be arrested if I choose to smoke weed in the privacy of my own home", which most folks these days completely agree with me on that, so I go on to say "so if I don't want people nosing into my personal business where nobody was harmed, doesn't it follow that I shouldn't nose into someone else's private affairs that again, nobody was harmed?"
And if they bring up the Bible and sin, I follow up with "Then that's between them and God. Christians are called to not judge. Remember the whole whole casting the first stone thing?"
I know this doesn't really answer your question.
But a start in that direction would be for public type officials to start respecting the privacy of the home in other matters, and maybe let it spread from there.