If killing animals for food is justified then whats wrong in being a Cannibal?

I had posted a question on cruelity to animals for consumption and insensitivity of people who consume them.A majority of carnivores forwarded vague & unreasonable arguments in support of cruelity.This question is aimed at them.Not to go far,in India everyone is aware of the "nithari killings" when accused Surinder Kohli confessed to having developed a taste for small children's flesh.He used to ually exploit them and kill them after which he stored their body parts and cooked them over oven for self consumption.Was he not right in choosing what food he took?Why should he be held for such acts?Why does the very society which supports such acts of cruelity towards mute and innocent animals shout hoarse over such cannibalism.After all people like kohli has every right to choose what they like as food.Please explain carnivores on this earth.