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You can’t compare the impact of actual native wild cats with the impact of domestic cats. It’s such a huge difference in numbers.
As you said, some areas have wild cats and the ecosystem is tuned to that. But even in those areas the comparable extremely high numbers of additional predators (domesticated cats) is damaging to the wildlife.
The RSPB says outdoor cats aren’t a problem and I linked to a study done by Bristol University in another comment that states they aren’t a problem.
Feel free to fuck off and read them and stop talking like your rules are universal across the globe.
I don’t know where the hostility comes from, but here is a good review article that has a global overview of the impact free-ranging cats have: https://besjournals.onlinelibrary.wiley.com/doi/10.1002/pan3.10073
It calls out several studies from the UK that do highlight the impact of cats on the wildlife.
An additional interesting point is chapter 4.4 “The interest of cat owners”:
Like I said - feel free to fuck off,