The problem with eating meat is not the eating meat. I don’t give a fuck if someone eats meat from an animal that hasn’t suffered, that was free and in its natural habitat. I don’t know if I would myself because after 15 years of not eating meat I don’t think I’d still like it, but it’s not unethical. The problem is the untold amount of widespread suffering and cruelty of beings with emotions and sentience and attachments and capacity for both physical and emotional pain that is industrial livestock farming.
You can get a cat for who it is more beneficial to stay inside. For example cats who are scared and skittish or cats who are fiv positive. The former should stay inside for their own safety and the latter for other cats’ safety. And they too deserve a home :)