Some people at NASA thought there was a problem. Some people at NASA ignored them. Why does this continue to happen? The shuttle is the most complex, yet jury-rigged device ever created and NASA management treats continues to view defects improperly. The engineers know but the people who actually make decisions do not appear to. Apollo I was destroyed in 1967. Challenger was destroyed in 1986. Columbia was destroyed in 2003. Until NASA make major changes, I would imagine that we will continue to see deaths every 20 years or so.