To maintain a certain grade of biodiversity. Yes, species die out eventually, but the current rate of animal extinction is relatively high thanks to human encroachment and agricultural monocultures that have replaced regional varieties.
Do you want to live in a world that only has humans, cats, dogs, cows and pigeons?
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What the Hell has Pigeons ever done for us?
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Nothing ... nothing at all. We just can't get rid of them since they've adapted to urbanization.
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That's the point. Would you rather live in a world with only a few species including ones we typically dislike such as pigeons, or would you rather have a much larger variety of species?
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Well I guess that's right, but can't we kill off pigeons anyways?
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They will eventually all kill themselves from stupidity.
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Lel, stupid birds.
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At this point I doubt we could. I hear they breed like gremlins.