Possibly downvoted because of no references. So first, cats are a menace to wild animals. Second, "We estimate that free-ranging domestic cats kill 1.3–4.0 billion birds and 6.3–22.3 billion mammals annually"[0]. Entirely humans' fault of course. Without humans there wouldn't be so many cats.
I'm sure the downvotes are because the people that are firm believers in poisoning the environment with sprays are the same ones that refuse to believe that little Fluffy needs to stay inside because its a relentless animal killing machine.