Our nation's food supply chain is not equipped to feed everybody on a vegan diet tomorrow. Even if they aren't the only sources, our society is geared towards meat as the primary source of nutrients such as proteins and iron, and if all meat disappeared from the shelves it would make plant foods more scarce due to higher demand. We can't operate based on your perfect ideals, we have to operate based on reality. And the reality is that meats are an essential food in this society.
I agree, vegan diet would be very hard. But vegetarian would be doable. People get protein from eggs, cheese, nuts. They’re also at risk from supply chain disruption, but they don’t seem to require humans to go to plague factories.
Again, I’m not saying that we should experiment for the sake of it. I’m saying the experiment is going to happen because our industrial meat supply is fragile, and I’m curious what it’s going to look like.
Rationing in the UK in World War II was a deeply unpleasant and inconvenient experience for most people, but no one actually went hungry and many people were much better nourished than in peacetime. It’s that kind of thing. Nothing to celebrate but it’s happening.