Here are some talking points that I use.
"Hunting is part of the natural process of life. By participating in that process, I am become more in sync with nature and that natural process. Venison is the ultimate organic, free-range meat. I process my own deer (I really do) to get the freshest highest quality meat available. I view harvesting a deer in a similar way as picking vegetables in a garden or picking wild blackberries! The deer live there life just the way they always have...in the woods, seeking food, avoiding predators (me!), with free will to do as they please. Most hunters are respectful of their prey and in deep appreciation of the beauty of all wild animals and the woods and fields in which they live. As in any area of life, there are a few bad apples who make bad choices (trespassing on my posted land!), but my experience is that they are in the minority. I try to be as skilled and effective in the harvest as possible, and I don't relish the loss of life of the deer. But death is a part of life and the life process."