I don't think that raw meat is any more primal. If you are out stabbing game animals and you're hungry you may just eat some raw meat before you drag it back to your home but cooking is preferred since it softens the tissue and you absorb more of it. That book "Catching Fire" is downright plausible in that cooking meat helps us get more energy from it. And I would wager that the incredible potential for longevity of humans is due to adaptation to cooking food - we are endogenous antioxidant machines if we get the proper nutrition. There is some animal flesh like sashimi that it might not matter so much for, and hey maybe a little raw meat is a good thing, although I don't have any reasons why it might be.