(I'm probably going to get flamed but...)
Why is it so much worse to slaughter a horse than a cow? I'm sure many of you like beef and therefore "like" slaughter as a result so why can't I like horse meat and "like" slaughter of them as well without being heartless? I don't like it any more than the next person to see anything at all suffer, from cockroaches, to horses, to humans, but I also don't see a painless death as a bad thing. What's so bad about it? You're dead, you can't think or suffer or anything! Not such a bad state, I think.
Maybe it's just cultural differences or something. I often joke and say I like everything about horses, even their taste.