There is a difference between killing them without causing pain and beating them up till they die. And I was talking about the physically abuse, animals for production do get objectified and I personally don't see anything against (once more; as long as they don't get harmed in any way).

And just to keep it on your level - why don't you count plants as living things? According to the main points of the definition of life they do have a metabolism, run mutual reactions with their enviroment as well as running a homeostasis, reproduce and register chimical changes in their enviroment. So why do you decide to kill plants - is that humane for you? And besides, unlike most animals, they're mandatory for us to live, especially alga.