A few facts that support the fact we evolved as a Herbivore's and not opportunist prats.

Facial Muscles

Carnivore: Reduced to allow wide mouth gape
Omnivore: Reduced
Herbivore: Well-developed

Human: Well-developed

Jaw Type:

Carnivore: Angle not expanded
Omnivore: Angle not expanded
Herbivore: Expanded angle

Human: Expanded angle

Jaw Motion

Carnivore: Shearing; minimal side-to-side motion
Omnivore: Shearing; minimal side-to-side motion
Herbivore: No shear; good side-to-side, front-to-back

Human: No shear; good side-to-side, front-to-back

Major Jaw Muscles

Carnivore: Temporalis
Omnivore: Temporalis
Herbivore: Masseter and pterygoids

Human: Masseter and pterygoids

Mouth Opening vs. Head Size

Carnivore: Large
Omnivore: Large
Herbivore: Small

Human: Small

Saliva

Carnivore: No digestive enzymes
Omnivore: No digestive enzymes
Herbivore: Carbohydrate digesting enzymes

Human: Carbohydrate digesting enzymes

Liver

Carnivore: Can detoxify vitamin A
Omnivore: Can detoxify vitamin A
Herbivore: Cannot detoxify vitamin A

Human: Cannot detoxify vitamin A

And the list goes on and on and on and on

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