The OP might be throwing bad examples, however there is science to (almost) back him up.
Our canines are underdeveloped compared to both mammal carnivores and omnivores. They are not suited to ripping through pelts and tearing off great chunks of meat. No other large omnivore has a jaw that articulates side to side. One of our nearest (living) relatives, the Chimp, gets most of its animal protein incidentally. The human gut is not nearly as long as most carnivores because uncooked meat requires a longer digestive tract.
Our modern diet is insane and is causing heart disease and diabetes. Even 150 years ago, meat was something of a luxury, and was consumed less frequently and in smaller portions.
One should be mindful of what one eats, but avoid fanaticism.
One of my favorite theories as to how our ancestry got us in a state that would inspire such a heated debate:
https://www.ted.com/talks/elaine_morgan_says_we_evolved_from_aquatic_apes
Edit: @ Swede - Infant killing and cannibalism in free-living chimpanzees.
Goodall J.
Abstract
Male chimpanzees at the Gombe National Park were twice seen to attack 'stranger' females and seize their infants. One infant was then killed and partially eaten: the other was 'rescued' and carried by three different males. Once several males were found eating a freshly killed 'stranger' infant. A similar event was observed in Uganda by Dr. Suzuki and Dr. Nishida reports an incident from the Mahali Mountains, Tanzania. A different kind of killing occurred at Gombe when a female and her daughter killed and ate three infants of other females of the same community during a 2-year period. There is evidence suggesting that other infants may have died in this way. The paper draws attention to puzzling aspects of infant killing and cannibalism in chimpanzees.
Doesn't sound all that common. Carnitine deficiency maybe?