God takes care of birds but alas depends on people, some of whom are lazy, irresponsible, misguided, and arrogant to look after cats.
I think people have watched to many Sylvester and Tweety Bird cartoons and take the role of the old granny that would always hit Sylvester with an umbrella. In the real world, birds are often filthy carriers of disease and cats fulfill well their God-given role of keeping the dirty bird population down. People who love the widdle tweety birds need to keep them in cages and enjoy them there and let the cats do their pest control work in the real world.