It's possible to roll an honest set of dice a million times and have them come up 7 each and every time. It's also so unlikely that, for any practical purpose, you might just as well call it impossible. Like getting anything that even approaches "acceptance" for zoophilia/bestiality.
The ONLY thing that can be done by "standing up for zoo rights" is reminding J. Q. Public that yes, those perverts exist - we haven't managed to stomp them all out yet - but give us a few more years, a few more laws on the books, some more money to throw at the problem, and we'll eliminate those freaks from society once and for all! (not that I think it's even possible for that to happen, but you get my drift, I hope) Which is, I hope you realize, also the answer to how activism puts me at risk. I do my best to "fly under the radar" in the real world. It saves me from jail, and my animals from being seized, mutilated, and/or killed. ANYTHING that puts the idea that humans even CAN fuck animals, never mind the thought that some actually *DO* in the mind of John Q. Public "lowers the radar", making it that much harder for those of us trying to stay below it. You deciding to leaflet the town does exactly that - it puts the idea in the front of John Q.'s head that people like me exist, which is a bad thing, no matter how you try to frame it. Shut up, sit down, and keep your head down, and J.Q. eventually forgets we exist. Except that it seems like there's always some up-and-coming idjit who comes along and decides "Time to try it again", stirs the pot, gets burned (or worse, causes someone else to get burned) when it slops over, and there we are right back at the start of the loop again, ready for another go-round, only this time, with another law or three on the books, and greater public awareness of our existence, with the attendant behavior (more security cams, more patrols, more difficulty finding time to be alone with our partners, etc, etc, etc) that goes with being alerted to how terrible a threat it is that some guy likes to run his cock up Fido's rear end, or, even worse, some deviant woman allows a dog to fuck her.
Problem is, there is no "up side" to the equation - Assume a best-case scenario: Your leafletting campaign gets traction, and just like the gays, overnight it becomes, if not "popular", at least "accepted" that somebody who dips his dick in an animal is just another person, no different than the guy that dorks his wife every tuesday. Hooray! We're legit now!
So what? What's change? Idunno about you, but you can damn-well believe that I won't be doing the "out-n-proud" thing. Whoopie with my horse is gonna stay in the barn, wth the aisle doors locked from inside, and the shutters on the windows closed. Not out of shame, or even fear (although the fear of being busted will always be there) but because unless you're looking to trade on the fact that you fuck horses like it's some sort of "Me so speshul!" card, THERE'S NO LEGITIMATE REASON TO ANNOUNCE IT! Exactly like there's no legitimate reason to announce "Hey, everybody! Gather 'round the water cooler! Guess what? I fucked my wife last night! Blew my nut in her, and she screamed for more!"
Yeah? So? And I have even a measurable amount of "give a fuck" about that little factoid because... ?
Problem is, the reality is, for a *LONG* time to come, perhaps for all time, and for the insanely overwhelming majority of the human race, it's "You fuck animals? Gawd, that's sick! Why don't you just go find a rock to crawl under and die? You're nothing but a disgusting pile of filth! On second thought, here, let me HELP you (and even more important, at least to me) and the contaminated horse you stick your dick in die!"