While this is indeed unfortunate, it seems that many cat “owners” allow their cats to roam. Don’t cat “owners” have any respect for the poor songbirds that their cats tend to kill? How insensitive is that?
My spayed/neutered cats roam freely (but also have a cat door so they’re never stuck outside looking for food or shelter). At the first sign of a propensity to kill healthy birds, the ID tag and rabies tag on kitty’s collar is joined by a nice loud bell. Does the trick. And I scatter a generous helping of birdseed in my driveway everyday — provides entertainment for kitties and fattens up the birds so they have plenty of babies of every year. I’ve had 3-4 indoor-outdoor cats for the entire 20 years I’ve lived in this house, and they certainly haven’t made a dent in the bird population. I’ve got a much wider variety of birds than when I first moved in.