We don't know the spiritual advancements long-term veganism - over generations - would have for human life. It would be certainly a different civilisation, and the first one in the whole of our history that would truly deserve the title of being a civilisation.
I am a Canadian, free to speak without fear, free to worship in my own way, free to stand for what I think right, free to oppose what I believe wrong, or free to choose those who shall govern my country. This heritage of freedom I pledge to uphold for myself and all mankind.