The New York Times has an article on NASA's "normalization of deviance". For more than twenty years NASA has accepted the failure of the safety features of the Space Shuttle. It's akin to driving a car with seat belts that have been cut in two for twenty years. Having not had an accident one lulls oneself into the belief it's not a safety problem. What the New York Times misses, though, is that this is the same problem that caused the Challenger incident two decades ago.