This is something I never put a lot of thought into until a couple years ago. As sportman we use the word kill not putting much into it however, anti-hunting groups and non hunters take offense to it and puts us out there for attack from them. I don't know why but when we use the word harvest they not pay much mind to it. I belive it comes down to the would kill being a word that catches everyones ear in a room while harvest does not.
Good Hunting.