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Of course this doesn't justify mistreatment. But it puts in perspective the idea that turning vegetarian, and banning meat would be good for those animals in question. It wouldn't: they wouldn't be alive in the first place.It's highly arguable whether they are better off being "alive", when this "aliveness" is so far off what they are genetically programmed to enjoy as a normal life.
For example, if an alien species took over Earth's biosphere and treated humans like we treat cows, raising them in overcrowded pens, feeding them food that occasionally contains human meat, forcefully inseminating the females every year and separating them from their young 24 hours after birth, then killing the females when they reach their mid-twenties because their fertility drops, and basically using a tiny proportion of males to make sperm and slaughtering the rest at a young age... would you make the argument that there's a two-way relationship there? That humans are benefitting in some way?
Even if they took these domesticated humans and spread them to the stars, ensuring their survival for millions of years, and protection from other predator alien species, so long as these "humans" were treated in this way we would not consider this to be beneficial to our species in any way. At least I wouldn't: better extinction than such a "life".
Obviously we can't ask the cows what they would prefer (or perhaps we can, we just don't have much interest in figuring out how to do it). If we did ask them, though, I doubt they'd see this relationship as beneficial to them in any way.