Cats do not kill billions of innocent song birds every year. That is pure rubbish. If you want to know who's killing the birds, look at Monsanto, Cargill, and Chevron. Look at plate glass windows and chemical/oil spills. Ever seen a cat kill a swan, or goose, or even a little crow? No, I know you haven't.
Sure cats kill birds. Especially if people put out cat feeders full of sunflower seeds and millet. Snakes kill birds. Birds kill birds. Birds kill snakes, cats, and other birds.
This supremely stupid cat phobia is absurd. If cats were such deadly predators, we wouldn't be here typing on keyboards.