Why is death by predators more natural or right then death by starvation? how does one determine when an ecosystem is in balance? do predators really kill only the old and sick prey? what evidence is there for this statement

To answer,
1) Because it will suggest that the animal or organism has exhausted all its possible energy to work and find food than the latter, which indicates a lazy organism which has more highly probability of death than the latter.
2)To create balance, everyday organisms between prey and predator, producer and consumer and, biotic and abiotic factors of the environment rabble to this unending cycle or maintaining balance. 

We can plant more trees and plants.