I killed for years. You can wrap up every casualty from the Civil War, WWI, WWII, Vietnam, Korea, Iraq, and Afghanistan and wouldn't even come close to the number of lives I've taken.
But one night, not so long ago, I was sitting on the couch and noticed a small fruit fly had fallen into my beer. It was still moving. I stuck my finger into the beer and pulled the little fly out. I held it up to my face for a better look and watched as the fly began to rub it's legs across its wings, in an attempt to dry them out. The fly then flapped its wings, drying them out even more. The front legs began wiping its face. I watched this for several minutes. The fly then jumped up and down a bit as if taking a few practice take offs.
I don't know what came over me at this point. In any other situation that fly would have not even had remains left after one swipe of my hand against the floor. But this time, I slowly stood up, walked to my sliding glass door, and opened the door. I stuck my hand out and gave a quick blow to the fly. The fly released its clutches from my hand and was gone. I sat back on the couch and thought back on all the bugs I had destroyed in my life. I then looked at my dog and thought of how horrified I would be to see my dog perish the same way all those bugs had died. I felt guilty.
From the corner of my eye I saw a spider making its way across my floor. I got up off the couch and went over to the spider. With one step, I squished that spider. Those damn spiders get in your bed and suck your blood. Not on my watch.