Whenever I try to bring up the subject, even gently, I am dismissed as a kook or am assured that their cat could never kill a bird.
Outdoor cats dangerous? Nobody wants to hear it.
But as the article -- by George Fenwick, president of the American Bird Conservancy -- points out, leaving cats outdoors is not particularly healthy for the cat either, even if you don't give a cat's patoot about wild birds. As for neutering and releasing feral cats, forget it...
The link is here.
A link to a column I wrote for The Record and Herald News on the subject (gently) is here. That's my cat Pook above; she's an indoor cat, always.