I think there is a difference between our ancestors eating meat and civilization now eating meat.
Then you had a very low human population hunting and eating an over abundance of animals to survive.
Now we have an over abundance of humans raising animals for the specific purpose of slaughtering and eating. Unfortunately the animals are not grazing on a plain somewhere, happily living their life until someone spears them to survive.
They are raised in deplorable conditions, are they thinking? I don't know, they are then slaughtered in the same deplorable conditions, butchered and packed up for your local grocery meat case.
I can't answer if we should eat meat or not. I do. With much pleasure. But I was raised this way. When you grow up "hunting" at your local supermarket, the triumvirate of chicken, beef and pork becomes so normal that you don't reflect on where it came from. It's a steak in styrofoam and plastic wrap, not an animal. You're not choosing a cow from a herd and overcoming it to survive, you are buying what you grew up eating and nowadays are trying to make "healthy oven fried chicken" to replace what Grandma made.
Maybe given enough time, enlightenment and forward thinking, children will be raised not thinking pork chops and hamburger are a way of life. That may be an ideal world. Is there enough arable land on the planet to grow plant based crops to feed everyone? I have no idea.
Cannablism? In situations of genuine life or death I don't think it's necessarily wrong. At that point, you may not have a choice, the survival instinct will let or make you eat human flesh if that is what you have to do to survive. POW's drank their own urine, ate their own vomit, ate bugs, maggot infested meat, anything to survive.
I think the gross factor will stop all but the most depraved in situations that are not life or death.
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