The law of unintended consequences states that changes to complex systems will produce results other than those intended. Forest fire prevention in the United States in the 20th century is a classic example; by aiming for total fire suppression, firefighters left huge amounts of flammable material in the forest, and when fires did break through the suppression, they were far more powerful and destructive. Essentially, the forest ecosystem had evolved to anticipate and depend on forest fires, and taking away the regular fires disrupted the system.
It occurred to me that meteorite impact prevention is going down the same path. We are on the verge of gaining the ability to identify and intercept asteroids that would otherwise hit Earth to tremendous effect. Is there any possibility that Earth ecosystems in some way anticipate or depend on meteor impact catastrophies?