There are people out there who understand this their desires are wrong. They avoid anything that could trigger these desires and go to therapy and take meds and try their best to live normal lives and not abuse the innocent. It's not impossible.
Even if this person hasn't engaged in sexual abuse of an animal (and I doubt that), he's still completely ok with interacting with those who do, and trying to spread a message that it's totally ok to do it because there are "ethical uwu" ways to be a zoo and other gross shit. This person is just as much of a monster as the people involved with all this.
even if you don't physically injure the animal during sex, you are still dooming them to mental abuse which has been mentioned and covered in these zoo threads more than once.
These people will never understand this, or outright refuse to. It's like talking to a brick wall. No matter how much evidence you could put in front of them, they'll still think we just "don't understand" and keep on doing it. It's not worth the energy and anger to argue with them. Just ban them and report them to twitter or whatever social media they are doing, and contact any authorities if you find any proof of the individual engaging in this shit.
I hope, if anything comes of all this, is that people start buckling down on animal abuse laws. So many of them are barely a slap on the wrist, and bestiality is still legal in most us states ffs.