and other beasts, but why don't humans have natural enemies

2. In ancient times humans evolved faster than their original natural enemies, (brains) so what were once man's natural enemies can now be easily killed by humans. (Use of tools)

3. Humans haven't jumped out of the food chain, except that animals that can eat humans usually don't have the opportunity to do so. And even being at the top of the food chain doesn't mean being invincible, "invincible" means eating all the food and dying out. Nowadays, people usually eat plant-based foods (people are in the second trophic level) to avoid food shortage

Lastly, it is emphasized that having no predators just means being at the top of the food chain