I do agree that we can eat meat, but I am not sure we really need too, unless we live somewhere where there is not enough plant food. Meat is only one source for protein, and some consider it not even a good quality source for protein.  What is more, we do not actually need the animal protein, what we need is its component, the amino acids. These are plentyful in plants too, however not all plants have all of the essential amino acids. Thus the need to pay a little more attention to how the food is combined.