Again, in my opinion, Sikhism does not turn us all into new age meditating veggies obsessed with mother earth and preserving the balance of life, Sikhism is about living in consonance with our surroundings, it is about eating animals, but showing some respect, it is about wearing leather, but also being grateful to the animal, a contribution to the world can take place in many ways, some contributions are in my view, merely lip service, some contributions are not, this is not a competition to see who contributes more, however, as is clearly written in the Sri Guru Granth Sahib Ji, the book that we hold dear, only fools wrangle over flesh, so every moment wasted debating this, is a moment that we could be contributing, to that end, the argument is moot.
However, as an animal lover, I would consider the veg way but purely on personal grounds, not because of a religion, or a way of life, but even then, it would be my own decision, and I would not dream of foisting it onto anyone else.