If you don’t enforce indoor only cats with high precision then feral cats exist everywhere as a result.
Literally no environment benefits from thousands of fucking cats.
You will look for any excuse to avoid the guilt of our failures as a species.
owning pets isn’t about maximizing environmental benefits. your own existence is a much larger problem for that but no one is telling you to live your entire life in a boring box because we have too many humans. this hill is not important enough to warrant all you folks dying on it.
If some people can’t minimize harm to the environment (and as a result, harm done to countless other people) then those people need their rights restricted. That’s the fundamental nature of laws: if you fuck it up for the rest of us then we’re going to have to step in.