Thanks for that informative and thoroughly depressing link.
As Paul McCartney puts it: "If slaughterhouses had glass walls, everyone would be a vegetarian."
I also put down my dog when we had to (which was way more distressing than that), so it might not be for everybody.
There is a world of difference between slaughtering an individual animal and a modern factory farm slaughterhouse.
So I thought that if you're willing to kill the animal yourself, then maybe you're able to condone the slaughterhouses even if you see them through a glass wall
(maybe it will diminish your appetite, though :P - I wouldn't want to see it while eating!).