>[1] https://www.nature.com/articles/ncomms2380
You're posting an article by the Smithsonian department employing that felon convicted for animal cruelty toward cats.
Wrt. the article itself - it has pretty much no scientific merits as, not surprisingly given the authors' agenda, the article has an obvious fundamental flaw disqualifying it from science - it doesn't specify how many of that wildlife killed by cats were old/ill who would be anyway killed by other predators if it were a natural setting and not a developed area where the only predators left are cats.
If we to believe the article's total numbers then it would really mean what the cats are just doing the job of other predators pushed out by humans. Killing the old/ill birds, reptiles, mammals by predators is good for those birds, reptiles, mammals species. (and around humans say an old/ill bird not killed by cats would become a dead bird and a food for rats or something like this)