Homo sapiens actually ARE primates. However, we are part of the Great Ape classification of primates, all of which consume meat to meet their nutritional requirements at least occasionally. In addition, eating meat, especially cooking meat is an element of what helped us evolve into larger-brained mammals, not just because of amino acids, which can be found in other foods, but because of the reduction of energy expense devoted to the gut and redirected to the brain, as cooked food is much easier to digest. So while there are a couple inaccuracies in your argument, I agree with your main point. Our bodies are engineered to process meat.