I understand the need to keep them under control, but count me as another one who hates killing animals. We had to shoot them at my uncle's farm when we were kids. I always missed.
In the middle of winter about a decade ago, I was driving down a side street and drove over what I thought was a clump of snow that had fallen off the underside of a car. At the last second I saw it was a pigeon, but it was too late. Poor little thing was just trying to get warm or something, and I feel bad all this time later.
We had a mouse about four years ago, and the mousetrap didn't kill it--it would bounce around every few seconds. So I filled a bucket of water and dropped the mouse and trap in in and held it down with a shovel for about five minutes just to make sure. Murder-Death-Kill. Murder-Death-Kill. Still feel bad about that one too.