If you eat lettuce, you’re killing an organism that was grown only to be slaughtered for your food. How cruel is that? Take a dead lettuce plant. Now make it alive. You can’t. There is, in living things, a thing called ‘life’. Once we take it, it can’t be given back. The way I see it, it doesn’t matter if we take the life of an animal, or we take the life of a plant. We’re taking ‘life’ either way. As Spock said, ‘In the strict scientific sense… we all feed on death, even vegetarians.’
People think it’s cruel to kill animals, IMO because animals move about and can communicate with us in their various ways. Plants just sort of sit there in one place and don’t make noises and don’t interact with us. But if you were to do a time-lapse film of a garden, you can see how vicious plants really are. One plant, for example, a vine, attacks another plant, strangling the life out of it; other plants use chemical warfare against other plants and animals; and so on. All organisms exist to exist. Just because we’re insensitive to different forms of life doesn’t mean we’re not killing them. To a plant being eaten alive, it might ‘think’ it’s cruel.
So I eat dead animals and, on occasion, kill them myself and then eat them, because a life is a life when it comes to food. Also, dead animals are delicious.