You’re right. Back then, we needed these teeth to eat the meat of our hunted prey. As pure herbivores, we probably wouldn’t have survived back then. However, our civilization has developed rapidly over the last thousand years, and the need to eat meat to meet our calorie requirements has become superfluous. Not to mention that our hunting instinct has also become obsolete, as we breed, fatten, and kill our prey industrially.

So I don’t accept your argument about biological naturalness under today’s circumstances. Very few people are forced to eat meat to meet their needs.