Humans are not "vores" at all--we can survive on any diet, containing no animal products or a lot--oppurtunivores if you like, there is no " natural" diet, and the typical meat-heavy western diet is not a biological, but an arbitrary cultural practice (and a very unhealthy one.) As X-man pointed out, there are plenty of arguments that our body is not designed for meat eating, and there is also plenty of scientific doubt that meat had anything to do with our evolution, so it's your personal belief system.
I've been a vegetarian my whole life, and in the past decade a vegan, so I'm not a meat-eating creature. I'm not concerned at all what my ancestors ate, and I certainly don't follow their other oft. ignorant customs.