I think a lot of your argument boils down to “Us vs Nature”, that the farm life of a cow is preferable to what might happen in the wild.
Don’t forget that male cow (steer) are typically killed on their first birthday, with some pasturalised cattle getting to live until 3. A cow is meant to live until 15-20. Male chickens are ground up or gassed upon birth. Dairy cows are kept constantly pregnant and separated from calves until they dry up and are no longer profitable by which time they’re immediately slaughtered. Sows are kept in sow stalls so cramped they can’t physically move, often never seeing daylight their entire life.
I think I’d take freedom over that.
If an alien species does come down, you’d hope they’d be more moral than us humans and wouldn’t factory farm us huh.
I don’t advocate for a complete vegan diet to start with if you can’t. Every meal you don’t eat meat is better for you, the animal and the planet. Substituting ingredients is easy, especially with fake mince - it’s probably the best faux meat there is.