People forget. They think that if something hasn't been a problem or hasn't happened in decades then it either no longer could be a problem (ignoring the "why" behind the current situation) or maybe it was never really a problem.
It's not logical, but it happens repeatedly. We see it at both the macro and micro scales. People forget the importance of vaccines for particular diseases because the disease is effectively eliminated from society (not gone, just not visible or as visible, like measles here). You see it with businesses or business processes, like maintenance activities. Proper maintenance means a chemical plant doesn't explode, but because it doesn't explode the proper maintenance seems like a waste of time, so the company cuts it and we have various disasters as a consequence. Also happens with aircraft (maintenance, training, proper FAA oversight, etc.).
It's not logical, but it happens repeatedly. We see it at both the macro and micro scales. People forget the importance of vaccines for particular diseases because the disease is effectively eliminated from society (not gone, just not visible or as visible, like measles here). You see it with businesses or business processes, like maintenance activities. Proper maintenance means a chemical plant doesn't explode, but because it doesn't explode the proper maintenance seems like a waste of time, so the company cuts it and we have various disasters as a consequence. Also happens with aircraft (maintenance, training, proper FAA oversight, etc.).