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I dont think all should be vegetarian. Its their desire but being vegetarian is good health
Never, i am a vegetarian but if everyone becomes vegetarian, think of it:
3/4th of earth is water and only 1/4th is land and all vegetarians depend on land  and others will depend on water for seafood but if 7 million people of the world depend on land i.e veg food we can be sure that there will be lack of food