This is just not true. Since time immemorial, humans have eaten meat and fish constantly as a main part of their diet. Catching fish and animals isn't that much different from digging up roots. We've eaten everything we can, not just vegetables.

And humanity has been drinking bovine milk for many millennia. Long before even the concept of capitalist "profits" existed. Again, see the Maasai for example.

And it's still the wrong thing to do. Humans got that wrong and stuck with it. They will argue till they are blue in the face and so will I.