My cat's quality of life was dogshit indoors. She had bad allergic reactions all the time, would stop eating, Vet bills piled up with no explanations. I let her roam the neighborhood now, shes happy as a pig in shit. Her weight is stable, shes not breaking out in rashes all the time, and she entertains the neighbors. Cry me a river about all the mice and bunnies she kills.
You do realize Humans are the one who spread cats across the globe right? The extinctions caused by outdoor pet and stray cats wouldn't have happened if human's hadnt have brought them with them you absolute ham sandwich.
Cool, but my cat has nothing on me as a human. Just by living you contribute to the death of millions, by your own logic. Are you gonna feel bad about that?