That's not the point he is trying to make. It takes everyone on their toes to avoid bad situations. Even then there is danger, but it should be much reduced. If one is lulled into a false sense of security because he bought thousands of dollars worth of traffic equipment he becomes a liability to himself and everyone else.
My theory on this is that everyone screws up. If I screw up and miss something, it's much more likely someone who is on their toes will see the problem and save our bacon rather than the person who is relaxed and not on their toes, that could make my screwup cost both our lives. (Just talking in general here, not about the accident or pilots in this thread.)