" One critic complained to me that "Well, if you are right, we will have to rewrite the textbooks!" As if that were a bad thing ... [But], curiously, some of our most virulent critics are associated with NASA and the government. A NASA employee tells me that this attitude of opposition to impact threats is entrenched in NASA and is only now slowly beginning to change. When it became obvious to NASA decades ago that asteroids and comets are a serious threat, their employees were instructed by top government officials to downplay the risk. The government was concerned that the populace would "panic" over space rocks and demand action, when NASA couldn't do anything about them and didn't want to admit it. Plus, trying to mitigate any impact hazards would have used up funding they wanted to put elsewhere. "

― John Anthony West