I've had to face this a number of times, it makes me sick to kill anything honestly. Not sick as in grossed out, the gore doesn't bother me as much as the thought of taking life. I've been raising birds for a short while and despite everyone thinking I'm odd for wanting to do so, I've done really good at it. The hardest thing for me is the kill. I never realized how hard it would be to have to kill a crying baby chick because it was born with it's guts hanging out, and they busted. I got in this for fun, and having eggs. But sadly you have to come to terms that, a good person that loves their flock will kill in the best way they can to prevent the bird harm or pain. Currently I use a hatchet so I can be more in control holding the feet in one hand and chopping with the other. I believe very strongly that as people we're getting too far from this knowledge of what it takes to live, so I keep that in mind while doing the hard to do things like putting down a chick, or troublesome roosters. I think if it bothers you, that's a good thing because that only means you value their life and there is no wrong in that.