Yeah I always found the argument absurd as I live on a paved over rectangle with a few square feet of grass my cat likes to poop on while he hangs out with the local squirrels. He is far too lazy to hunt anything, he killed a mouse that was actually inside the house many many years ago but has been a pacifist since. He is 15 he literally wants to sit in the sun and do nothing.
Of course there are some cats who will hunt, and their owners should not allow that. But the blanket statements about environmental impacts, while they cool their house with AC, burn fossil fuels to heat food and go to work, order crap on Amazon…just lacks perspective.
I have cameras, and I work from home. He literally does not leave a fenced-in rectangle. I know for a fact he doesn’t kill anything.