Ok then, it seems like the consensus is that vegans, vegetarians, and meat-eaters can all be healthy or unhealthy - depending on what foods their diet consists of.
I myself have been a meat-eater all my life. Recently, I just transitioned to veganism, (not 100% strict, I still eat honey and little amounts of chocolate and fish oil) but at least 90% of my diet is free of animal products. I find that although my protein intake has indeed dropped - which is ok because i actually want to lose muscle mass and become a little leaner - my overall diet has definitely improved b/c i am forcing myself to eat more fruits and veggies.
I am a mesomorph and naturally muscular so maintaining muscle mass has never been an issue for me.
Also, I don't really feel any more or less energenic, or any other perceivable chnage in health than before I changed my diet. Except that I find my meals are a lot easier to digest now without meat and dairy.
So basically I think that people can be healthy without meat and even without animal products in our diets as long as we are careful to steer clear of (for the most part) the processed, fried, and other junk foods.
I think its important what Steve says about looking at perspectives from the inside. So if one wants to bash vegetarianism or veganism, he/she should try it out first to make a more accurate comparison.