Because life is more interesting and entertaining with cats around.
Anyone who knows me more than about five seconds will pick up on the fact that I'm a crazy cat guy. At present, I live in a place where I can't have any pets, but as soon as that changes, I'm headed to the animal shelter on a mission to adopt. Why? Because cats are the best. As a child, I supposedly made the comment, "With cats, who needs television?" As an adult, I have sometimes fantasized about being the Elliott Erwitt of cats. I have no delusions of grandeur and do not actually think of myself that way, but I do find it reassuring to think of his wonderful photographs of dogs when I'm lying on the ground with a camera, trying to befriend a local cat.