I'd like to respond and not leave your assertions unchallenged, but I think your post is a bit too charged and absolutistic to engage with..pretty clear there is little room for debate.

I'll just say that since switching to a diet that contains whole foods consisting of meat, vegetables, fruits, nuts, and seeds, I've never felt better or been in better shape. I've seen the same results in many friends. If I have a big meal of grains I'll feel sick and almost hungover as a result.

Your mileage may vary, but have you tried it and seen what happens to your body? I've experimented with many types of diets, including strict veganism for about 3 months. So far a "paleo" diet has worked the best, for me.