Being vegetarian or vegan means respecting every living being,
But it goes beyond that; being vegetarian or vegan is a life style that, besides the respect of life, has many benefits for your health: prevents high colesterol, heart illness, diabetes, cancer and other diseases that are relatively new in the evolutive scale of the human being for the abuse of meat consumption.
And eating vegetarian or plant-based does not mean just eating vegetables and fruits, but eating great and delicious food including legumes, seeds, nuts, that are a excellent source of protein.
Besides, vegetarianism helps to create a more positive impact for the planet because it helps to reduce the green house gases that contaminate the Earth.
For more information, this documentaries have lots of good information: