I'm a cat lover. My daughter is a cat lover. A few months after she moved to New Zealand, she was in tears because her beloved cat had killed a beautiful little fantail. Her cat now wears a bell, but it has still managed to kill a bird or two.
Should we, as a favour to our feathered friends, stop keeping pet cats in New Zealand? All existing cats would be neutered. Over 20 years or so cats would become extinct in New Zealand and our feathered friends would get some relief from predators that would never have made in to New Zealand without our help.