- Our canines are useful for piercing fruit but not long enough or strong enough to puncture hide
- Horses and other clearly vegetarian animals have canines similar to ours
- Clearly vegetarian primates (such as Proboscis Monkeys) have canines for social and diet reasons
- Its 'natural' for humans to eat meat, as evidenced by our canine teeth.
- Our tools are our "teeth".
- We are a species famous for inventing tools to do jobs for us. It is therefore very likely that not possessing similar teeth to carnivores is the result of evolution (we haven't needed them since the time we invented the knife) and not a sign that our bodies aren't designed to eat meat.