https://en.wikipedia.org/wiki/Animal-industrial_complex#Negative_effects_on_workers
Partial automated slaughterhouses are just a matter of time. Then total AI and robotic rendering plants can do these gruesome tasks. As more branches of AI communicate with each other and compare data, a global digital brain will emerge.
If some AI and robots are programmed to kill animals and occasionally kill some people, what happens if they eventually decide to kill everything?
https://thedigitallabyrinth.blogspot.com/search?q=The+Grim+Reality+of+Slaughterhouse+Gas+Chambers