[snakeyjake]

>I'm not aware of ants ever having conflicts within their own colonies.

If most humans were mindless drones easily controllable by pheromones or physical gesturing, there would be no inter-tribe conflicts either.

Also, it is highly likely that humans do have natural enemies. There is compelling evidence that human beings are evolutionarily predisposed to recognize snakes extremely quickly, faster than almost any other object, and electrically speaking faster than our conscious perception of them due to the immense threat they once posed (and still pose) to humans.