Reddit reviews Confronting Animal Abuse: Law, Criminology, and Human-Animal Relationships

Yes, there are radicals that want total animal liberation, and they do have a particular hatred of sex with animals. A couple of them, Carol J. Adams and Piers Beirne, have written long, detailed arguments on their positions, including why they think sex with animals should always be considered sexual assault. Their reasons pretty much boil down to treating all cases the same as rapes resulting in physical injury and treating pet ownership as similar to slavery, invalidating any claim of consent due to inherent differences in societal power.

The first one depends on ignorance of the issue, while the second depends on a form of feminism that ties individual consent to societal power structures which are difficult to demonstrate at best. Their ideas are cookie cutter Marxism applied to animals, and like all Marxism, they dismiss the rights of individuals in favor of winning an idealized class struggle, resulting in even more suffering by almost everyone they claim to be helping.

In short, their view of the world is fundamentally warped by ideology, and as a result does not have the mass appeal needed to effect real change. They cannot succeed without becoming totalitarian rulers, and while things have been getting more chaotic politically in the Western world, they have not fallen apart to that extent, nor will they as long as people continue to call out their stupidity and cruelty.