i'm optimized proudly for the acquisition and maintenance of abundance. ^^
I smell less like nitrogen fertilizer, I'm better looking, I spend less money on food. My cooking takes way less time. My staples keep indefinitely and are always on hand, so I only visit the grocery store weekly OR LESS while cooking every meal that I eat. I am not required to sterilize counters and dishes with harsh chemicals after cooking -- a wipe will do. It is very difficult for me to overconsume. Helpless entities with their own subjective experiences do not have terror and torture injected into those experiences so that I can eat yum-yum candy. Abandoning the cycle of addiction, hedonism, and self-harm has conferred a tremendous competitive advantage to me and the time (LOTS of it), energy, health gained or conserved can be invested into the people I love. Unlike a meat-eater, I am committed to loving the people in my life fully.
Obviously the return to a more primitive state could necessitate my eating meat again to subsist. I would not have a problem with that. If we're really getting as sub100k redneck-family-dinner-table as your post I'll regrettably have to present the flip side: during the most risky period of the development of scarcity, when supplies dwindled to grain stores, I would be experiencing no withdrawal from meat. I am clearly no less optimized for than you are for scarcity and I probably also own more guns.
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About the source of vegetarianism culturally you're exactly right, dum-dum. Just like virtue and computer video games, conscious vegetarianism derives from sentience. It's a manifestation of that little bright-white kernel of you aside from the fat body and rumbly tummy that your mom loves. Don't curse the divine.