Perhaps it's just a weird direction of our moral dogmas. Maybe we should've maintain animals reputation as a food, and just that. I wouldn't worry then, I guess.

I am trying to ask my feelings about what's right and what's not. "Bread and dead mice" doesn't feel right. I'd try to change it somehow. Causing pain to a live being doesn't FEEL right to me either. Scientific reasoning or even logic is way less important. Even if we were created to eat meat doesn't mean we should keep on see more doing it. We don't have wings, but we started flying. We have limited sight, but we now see remote galaxies. We now try to avoid wars, cure deceases, plans flowers, build temples even protect animals. Our feelings evolve and when we listen to them we become better humans.

So, I felt that since we already need guts to see slaughtering it's probably the time to re-consider.