It's the only environmentally sound thing to do, and if you disagree, you're a bad person who dislikes wildlife and is is condoning the destruction of the environment.

http://rendezvous.blogs.nytimes.com/2013/01/23/a-plan-to-save-new-zealands-birds-get-rid-of-cats/?src=twrhp&_r=1&;

http://www.slate.com/articles/health_and_science/science/2013/01/new_zealand_eliminate_cats_they_kill_endangered_bird_species_and_shouldn.html