Sure, totally, but how many of us live in places where we have access to the cows but not non-animals foods that can sustain us? Virtually none. So while its true that human beings ate meat for good reasons for a LONG time, its not really something that most folks need anymore.

Is it true that everywhere we have cows we can also grow soy or wheat or whatever? No, definitely not. Does that matter? No, definitely not.