Clarify your question !
What do you mean vegetarian ? In what ?
In the mouth ? or
In the heart ? or
In the mind ?
I see a lot of killing, cursing, stepping on each other here with their mouths, with their mind, with their books, with their religions/belief, with their arrogance, with their ignorance ?
What does it mean, if they eat "people" and not animals ?
What about drinking water, breathing air, and walking on the streets containing much baterias and microscopic beings ?
Does it mean killing tiny little things is OK ? If you eat vegetables ?
What do you want to prove ?
I thought "Xiao Xian Ren" just asked a similar question like yours regarding :
"Who follows the 5 precepts (5 jie)" in Buddhism ?