I'll lay it out simple;
Physically abusing, starving, and general neglect of animals, not cool. I think everyone can agree with that. The animal or pet or whatever isn't the one at fault usually, its the person for being a poor trainer.
Slaughtering animals for food, such as cows, pigs, etc., I do not see that a cruel. They're going to die no matter what, the animal kingdom has always been about the food chain, some must die so that others may live. That's not cruel, that's just life.