Jimlad, I can't find the link right now, but at least one study of cat atrocities on the bird and small mammal populations was found to have been grossly exaggerated. Certainly cats, and particularly feral cats, hunt, but by far the most efficient decimators of small wild creatures are humans. Check the number of migrating birds killed by tall lit buildings, the number of small mammals and ground nesting birds killed by agriculture and forestry practices, for example - tolls far outstripping even the most exaggerated accounts of cat predation.

It's alright to dislike cats, it's understandable to get angry about cat poo in your garden, or cats hunting under your bird feeders, but let's not blame cats for all the ills of mankind.