@Jellie I know you think you will find logic here, but you’d have a better time finding a needle in a 25ft stack of needles.
Why is bestiality illegal? It is a sin, that is why it is illegal. No matter how you slice it, it is a sin because it is a cross over from the Bible. Now secularly people want to distance themselves as much as they can from that fact but most major sins, are also crimes. The work “morality”, keeps popping up. The way, in which it is described, it is what the majority deems correct. As I have said before, secular morality is organized mob rule. If you have the numbers and the might to enforce it, your policy is legal and moral. If I lived in a small isolated community and we enjoyed cannibalism who is to say we were immoral? Visitors come, we fatten up at a feast, then we eat them. For us it would be normal, and thus moral. The only way it would be immoral is if we ate someone from a more powerful nation or group and they dispatched an army and defeated us, then they can hold us up to the flame of their morality and punish us for not complying. However, if they do not have the might to make us capitulate, if they didn’t escape back home to their lands or nation, we eat them too. It all settles in might makes right.
People try to use the non-consent card. Bogus, has no wind it its sails. Do dogs, cats and other animals consent to be help, some in cages, by their owners even if they benefit? That is a stretch, isn’t it? I could run with that one for days. I am sure, much less, they give their consent to be hunted and killed. That is an argument that is all hat and no cattle.
I am not for bestiality, though man has been given dominion over all the creature of the Earth. Bestiality is man or woman giving up natural relations for unnatural ones. As you say, we use animals for all sorts of things, guarding property, bulling sleds, finding dead bodies, sniffing out drugs, doing tricks, jumping through hoops of fire, whatever our sole whim is. No one ask an elephant if it want to prance around the ring holding each other’s tail for the amusement of some chubby 9ry old kid with cotton candy all over his face. In reality, animals have no say over anything. In a secular sense, animals are used for anything else, so using for sex would be just as natural.