John,
Taking a photo is hardly comparable to killing an animal, but I think you know how silly your analogy is.
By your reasoning;
Why would anyone take a photo at a sports event? They are themselves not participating.
Why would anyone take a photo of a beautiful landscape that they have not climbed, swum, or hiked?
I have a number of photos that I have taken during my travels around the world framed and hung up on my wall at home. There is a sense of satisfaction and pride in taking an excellent photo and utilising the only creative bone in my body.
Believe me, if it was possible to play, I surely would. This is the next best thing.