Take it from the airline industry: assigning blame is not a good way to improve safety. It's always a confluence of factors that leads to an accident. Change any single factor and the accident probably wouldn't occur. Moreover, humans have been proven time and again to be easily distracted, lazy, tired or simply not following the rules. The first step in achieving the goal of improved safety needs to accept that humans are flawed, yet strive to improve safety in spite of that.