Depends on why you're killing them. For example, I don't think twice about swatting a mosquito or fly; love the sound of a wood tick going "click" in my Leatherman pliers. If you really think about it that tick's life is as important to the tick as your life is to you. Now if you want to restrict the thread to "game animals", I'd have to say that I'm not as fanatic about filling every possible tag that I was 30 years ago, I have absolutely no compunction about squeezing the trigger on a meat whitetail. I do however, get kind of a thrill to let a little buck walk by, that years ago would have been meat.
