Having canines is not proof positive of omnivorous (or carnivorous) diet, there are several animals that have canines way larger then ours (and larger then several predators) that are purely herbivores (gorillas and Pandas of the top of my head). Our canines also serve no purpose (other then maybe a threat display but even then they are tiny).
We are also not very efficient at digesting meat compared to a carnivore (and several omnivores). What we are really is purpose built scavengers, this also helps explain why many human cultures like their meat "aged". We can also thrive on a purely vegetarian diet which is not a bad thing if meat is scarce or no existent, it may prove to be an essential ability as human numbers outstrip our ability to produce food which we are getting close to (many would say we are already past that point) with out cutting back on meat production and shifting their diet away from human edible food.
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