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That sounds like a problem with outdoor cats. Why call out indoor/outdoor cats?

The only part of the complaint specific to indoor/outdoor cats is that they hunt even though a human will feed them. That's a complaint about the cats' morality, not a complaint about their effects.

It also assumes without justification that humans don't feed their outdoor cats.

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Cats hunting is a problem regardless of whether or not there are fed. It has zero to do with their 'morality'.

The problem is any cats that wander around killing multiple birds. So many people have cats that even a small percentage of them doing this is super destructive to the local birds.

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