I've also gathered some conclusive evidence: I don't eat meats, and I haven't died (not even once!).
But seriously, the fact that 10,000 years ago human-type creatures ate a lot of meat should be like number 76 on your list of arguments in the sustainability of diets debate.
Some related legal precedent, discussion, and doctrines. Note in particular the "Sweat of the Brow" doctrine, which holds that rights may be granted "through simple diligence during the creation of a work...Substantial creativity or "originality" is not required." Looks like this doctrine was rejected in Feist v Rural.
But seriously, the fact that 10,000 years ago human-type creatures ate a lot of meat should be like number 76 on your list of arguments in the sustainability of diets debate.