I've had to grip this same topic numerous times in my life. I enjoy watching wildlife and feel they are defenseless at times. I try to counter my argument with the fact that there are less and less preditors for these animals and humans must control the population so that disease doesnt take over or that animal changes the landscape by over eating the land. Also try and tell yourself that you'll be more respectable to that creature compared to some random Joe who is just killing the whitetail for some backstraps and a mount on their wall.