I know this may derail the thread, but if you're going to play the evolution card, I'm going to have to disagree with you because humans have evolved (or are evolving) to be predators.
You can't possibly know what humans are evolving into in this regard -.-
Firstly, we have the eyes of predators. Predators normally have eyes that are close to each other (like we do) so we can focus in on our prey. Prey generally have eyes further apart, or on different sides of the head, so that they can observe their surroundings.
Forward facing eyes are common in primates. Also, you can see certain other herbivores with forward facing eyes, like the koala bear. Either way, one similarity between humans and other carnivores doesn't seal the deal, especially when you look at other comparisons:
Facial Muscles
Carnivore: Reduced to allowed wide mouth gape.
Herbivore: Well developed.
Human: Well developed.
Jaw Type
Carnivore: Angle not expanded.
Herbivore: Expanded angle.
Human: Expanded angle.
Jaw Joint Location
Carnivore: On the same plane as the molar teeth.
Herbivore: Above the plane of the molars.
Human: Above the plane of the molars.
Jaw Motion
Carnivore: No side to side movement.
Herbivore: Good side to side moment.
Human: Good side to side movement.
Major Jaw Muscles
Carnivore: Temporalis.
Herbivore: Masseter and pterygoids.
Human: Masseter and pterygoids.
Mouth Opening vs. Head Size.
Carnivore: Large.
Herbivore: Small.
Human: Small.
Teeth: Incisors
Carnivore: Short and pointed.
Herbivore: Broad and flattened.
Herbivore: Broad and flattened.
Teeth: Canines
Carnivore: Long, sharp, and curved.
Herbivore: Dull and short.
Human: Dull and short.
Teeth: Molars
Carnivore: Sharp and jagged.
Herbivore: Flattened with cusps.
Human: Flattened with cusps.
Chewing
Carnivore: None. Swallows food whole.
Herbivore: Extensive chewing required.
Human: Extensive chewing required.
Saliva
Carnivore: No digestive enzymes.
Herbivore: Carbohydrate digesting enzymes.
Human: Carbohydrate digesting enzymes.
Stomach Acidity
Carnivore: Less than or equal to ph1.
Herbivore: Around ph4 to 5.
Human: Around ph4 to 5.
Stomach Capacity
Carnivore: 60% to 70% of total volume of digestive track.
Herbivore: Less than 30% of total volume of digestive track.
Human: Less than 30% of total volume of digestive track.
Length of Small Intestine
Carnivore: 3 to 6 times the body length.
Herbivore: 10 to 12+ times the body length.
Human: 10 to 11 times the body length.
Colon
Carnivore: Simple, short, and smooth. No fermentation.
Herbivore: Long, complex, may be sacculated.
Human: Long, complex, sacculated.
Liver
Carnivore: Can detoxify Vitamin A.
Herbivore: Cannot detoxify Vitamin A.
Human: Cannot detoxify Vitamin A.
Kidney
Carnivore: Very concentrated urine.
Herbivore: Mildly concentrated urine.
Human: Mildly concentrated urine.
Nails
Carnivore: Sharp claws.
Herbivore: Flattened nails or blunt hooves.
Humans: Flattened nails.
Thermostasis
Carnivore: Hyperventilation
Herbivore: Perspiration
Human: Perspiration
There are more too, including average time spent sleeping per night. Humans again fit in with other herbivores when it comes to hours spent sleeping per day, which is much less than most carnivores. Also, I should mention that TRUE omnivores (animals that eat both meat and vegetation as a SIGNIFICANT part of their diet) often tend to have a lot more in common with carnivores than herbivores. Bears and racoons are a good example of this. Claws, sharp teeth, no horizontal jaw movement, ect.
We don't have very specialised teeth, but we don't need them because we have very sophisticated limbs which help when subduing and eating prey. If you look at the animals with the most specialised teeth (herbivore or carnivore) they often have limbs which don't aid them in the comsunption of their food (cows and crocodiles are two good examples respectively).
Are you suggesting a human being could subdue an animal with just his/her limbs? Most animals are too fast and/or too strong. I'm not gonna say I know what our limbs are "intended" for, but if they are the way they are to help us subdue prey, we probably got the worst card evolution has handed any species in the history of the world.
We don't seem to have many herbivore adaptions either. It was my understanding that many herbivores had something like four stomachs. Herbivores usually have heads that are close to the ground for grazing (cattle and ungulants), elevated heads to reach tree vegetation (giraffes and certain herbivore dinosaurs, or are tree/climing based (other primates). Humans don't have adaptions that specialise in any of these.
First of all, the great apes tend to be more terrestrial and less tree dwelling, and they're still herbivores. Not to mention that a huge amount of vegetation doesn't even come from trees so I don't even know what you're getting at.
Second, saying that humans aren't like ungulates is not really going to help you convince anyone of anything. Think about it...you can't say say "humans are not herbivores because ungulates are herbivores and humans don't share a few of their traits". There's a serious gap in logic there...plus like I showed earlier, we have a lot more in common with them than you might think. Still, here's a short list of animals that go against your logic. I'm sure there are countless more, these are just a few basic non ungulate herbivore mammals off the top of my head.
http://en.wikipedia.org/wiki/Beaver
http://en.wikipedia.org/wiki/Kangaroo
http://en.wikipedia.org/wiki/Rabbit
http://en.wikipedia.org/wiki/Elephant
I'm not saying we've evolved to become pure, specialised carnivores. We're omnivores and insectivores, like most new kingdom apes, except unlike most of them we're not tree based so our diet isn't necessarily supposed to be vegetation dominated.
Except all the apes that are our closest relatives are primarily herbivores, NOT omnivores. Their diets are 99%+ plant based foods. Yes they DO eat other animals sometimes but that doesn't make them omnivores when talking from a purely anatomical or taxonomical perspective. I could drink bleach, would that make me a bleachivore? No, it would make me an herbivore who decided to drink bleach. You know it's like...cows eat insects that are on the grass they eat. Does that make them omnivores? No, they're herbivores who happen to be eating bugs.
At the end of the day, if you still don't want to believe that humans are herbivores, look at the data that shows how people who eat meat are MUCH more likely to develop various diseases and other medical conditions. We can argue all day about what humans are naturally designed to eat, but all the data I've ever seen shows that people who don't eat meat live longer, healthier lives with a much lower risk of all types of diseases, even when their diet choices have nothing to do with them trying to be healthier. Quite frankly, that should be enough for anyone.