I'm not a vegetarian, are you?
I am, I refrain from eating meat out of respect for living creatures.
Then what is their purpose on the earth then?
I'm not sure but I am buddhist so I value virtue, morality, and moral discipline and that includes respecting all living creatures.
Oh, I can respect your views. How did you learn about Buddhism?
I was raised in a Korean Buddhist family. It's not exactly like Mahayana Buddhism. There are some similarities though.