As long as they're not the one who slaughter them in person they don't even think about this stuff... and freak out when they see animal corpses.
I was witness of that, when I was in Egypt: muslims slaughter the animals and suspend them for the feet so that all the blood (that's impure) can leak out. I wasn't shocked by that sight since it's normal to imagine something dead if its meat we're talking about, but some people I was with were about to faint... or throw up -_-

~ Alessia