It's easy for zoophiles to forget that for the "average" person it seems about as appealing as something like necrophilia... not that it's comparable as an act at all, just the stomach-turning idea is about on the same level.

But why? Lots of reasons put together. Biologically we're not supposed to mate outside our species, there's just supposed to be no attraction at all, so most people really aren't wired to accept it as something even possible. Which by itself might just lead to an indifferent population. But because even a handful of people find it so horrible and gross, they speak up and turn the opinion of the majority who might normally just not care and it becomes a cultural stigma that propagates. If you're indifferent about something, it's very easy to turn you in one direction or another with even a shred of evidence, and we've heard that evidence a thousand times... consent, abuse, health, pedophilia... we know the drill, we've all heard the thin, leaky arguments over and over, and the more people make the argument, the more indifferent people are swayed.

The biggest contributing factor is that our society makes sex bad. We're taught from early ages just how bad and awful sex is, how we're not supposed to look at it, think about it, do it, etc. Sexuality is a deeply personal issue that touches nerves like little else, simply because it's something bad, that everyone wants. Billions of people running around trying to feel loved and desired and have their sexuality validated by someone else, something that's such a huge, defining characteristic of our very existence. But we still have to be very careful talking about it. We still can't let others see our naked bodies, or see those of others. We don't want our sexuality questioned, because to do so is to question deep, scary parts of ourselves that again, we can't look at honestly because it's so bad. The fight for equality in marriage showed us a real deep look at the fear people have about sex. And how angry or upset people can become simply by having to acknowledge that other people have variances in sexuality, that there is no "normal" and that sex is something people do because they have desires, not just a function of reproduction that we have to do.

These ideas make us all realize that we're responsible and accountable for our own lives, for how happy we are with our sexuality, with how satisfied we really are. Few people ever really learn to open that black box.

So to look at something that falls waaaay outside the spectrum of normal sexuality, that's incredibly frighting to some people. It forces them to think about things that make them uncomfortable, to ask questions that do not have a right answer. To take away assurance and stability in life.

TL;DR: fear.

So you are saying their ISP ratted on them?