Earlier quoted context omitted.
We're still chopping up likely-sentient animals and eating them, so it's probably a ways off..
I believe I read this in the book Grandfather by Tom Brown [1] (could have been somewhere else). The author was taught by an Apache elder about survival, etc. Part of that was learning how to track and hunt. The first time he killed a deer, he was required to sneak up on the deer and kill it with a knife. That way he would know the gravity of what he was doing. He wrote that he cried for a good while afterwards. I th…
There's also the problem that for most people in developed countries, you don't actually need to take a conscious life to sustain your life. It's a luxury, like wearing fur.