When people eat, their jaws don't go up and down like a typical predator. Look at how the carnivores eat. Tigers have sharp teeth and they have a strict up and down motion when they chew. Even dogs who are omnivores chew in the same fashion. People chew more like cows.
We don't just gulp and swallow. We have to mull on it.
Besides, if we were supposed to be predators (that doesn't even make sense) but let's just assume that all animals are made to adhere to the food chain,

...Why don't we have claws? Why can't we run fast like the other carnivores? People are pretty bad fighters too unless they spend years of training to learn how to do it. We aren't naturally brutal creatures.
Most primates are predominately vegetarian. We are not specialized animals when it comes to eating habits. We can eat whatever we want to eat.
To refuse to acknowledge that hunting and killing for food is a basic component of human development is a major ignorance. American Indians used the buffalo as a major part of their food supply and one of the reasons for the enthusiasm for killing buffalo was to deprive Indians of food.