I think if you're a vegan then it's fine to object, but if you look down your nose at someone killing something that will ultimately be eaten even if there is an element of sport etc in it then you need to have a look at how the meat you eat from supermarkets is actually produced. A grouse has a far better quality of life before its death than your average diary cow, intensively reared pig ( THAT is horrific), veal ( and that) or chicken. My parents thought it was important that I know how to humanely kill something to eat when I was a kid, as they found shopping for stuff that someone else had killed didn't really get the point across that it's something's life being taken for our Sunday lunch, so I've killed things, prepared them, cooked them and eaten them, and I don't have a massive problem with it. That being said I'm largely ( but not completely) veggie these days for that reason, I think it's not very ethical eating our fellow planet dwellers.