Without predation, prey populations would grow so quickly that the ecosystem would suffer. For example, in the early 1900s, the ranchers in the Kaibab plains near the Grand Canyon killed many of the local wolves and coyotes. Without these predators, more deer survived. After several years, there were so many deer that food became scarce and thousands of deer starved to death. Predators and prey need each other to keep their populations in balance.
Predators usually capture the old, crippled, sick, or very young animals.
Very rarely are healthy adults caught and killed. In this way, only the strongest and smartest animals are left to reproduce. Over long periods of time, predation actually improves the health of the prey population. The entire passage is founded on natural theology, a corpus of religious doctrine propounded some 200 years ago by the English churchman William Paley. That is nonsense.