more of both is against the natural law of predator => prey
more predators, means less prey because they are eating them, which eventually means less predators due to low prey numbers...which leads to more prey due to lack of predators, and the cycle continues
Both the prey and predators would rather stay away from civilization, it is a natural instinct. So if they are encountering humans regularly and starting to enter into habitats unnatural to them, it is because their natural habitat has been upset in some way.