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Don't let your cat outside unless they are in a enclosed area
Why?
Because cats are a godawful menace to local small vertebrate populations.
Outdoor domestic cats have directly contributed to the mass extinction of at least 33 species of wildlife worldwide: https://www.fws.gov/sites/default/files/documents/keep-cats-indoors.pdf
Plus the obvious answer, they live longer when they can't be mauled or run over.
OK, thanks.
So I guess the situation is this: it depends. For example our cats do kill a bird a year maybe (species that are around in large numbers) but they mostly hunt mice which are abundant in most places and it's actually a benefit to cull their numbers.
While we also had one cat get poisoned by assholes we don't have any issues with cats getting run over ever and that's in a (EU) city.
They murder so, so many birds.