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The word natural is doing a lot of lifting here. I think we are talking past each other because we don’t have the same framework for understanding how ecosystems work. Predation by an invasive species is not natural in the sense that the species did not coevolve. It seems we don’t agree that cats are an invasive species or even on the definition of an invasive species

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There is very little natural in the unnatural environment of the human developed areas. That train has long left the station. That includes the natural predators. With those natural predators gone, cats are doing the job of those predators. Whether you call the cats invasive or not - the label doesn't matter in that situation, somebody has got to do the job.

And the main invasive species is humans. The humans invade and change the environment, and the cats are actually natural in that new environment.

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