are vegetarians more ethical by not eating meat?

[littleendian]

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Considering that the human body is totally in line with a vegetarian diet (fruit, nuts, grain, vegetable etc) then you would draw that your theory is just a dogma (false true).
Only in time of calamity like the ice age or other disaster humans had no choices but to eat meat, but for ages and ages human were almost completely vegetarian.

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The biological argument hasn't been discussed here, yet, thanks for raising it, although I think it's not going to resolve the issue.

Biologically we are clearly omnivores, any cheese-burger with wheat buns and a cucumber on top will prove that one. While there are convincing claims that the excessive consumption of meat we see today is actually detrimental to our health, there is very little proof that having a steak once a week is going to cause any significant health damage. (Except for the cow, of course.)

However a significant number of humans, around 400-500 million in total or around 7 percent of the global population, exist on a plant-based diet, which shows that we do have a choice between eating meat or not eating meat and hence it is not primarily a biological question but rather a moral one.