Hmmm, I didn't say it was dangerous, I just said it was extreme.
It's not actually "useless" information to me, because I am a chemical engineer. The design and operation of chemical processes is the whole of my professional life. I'm supposed to know about that stuff to do my job.
In fact, the cause of industrial accidents is rarely operator inattention. Accidents are most commonly caused by people actively doing the wrong thing, and usually when a whole series of mistakes are made in combination, all of which conspire to create the conditions for a calamity. Causes of big accidents are typically traceable to organisational mismanagement rather than any one person's error. Just look at NASA and the shuttle disasters for an illustration.
Trevor Kletz has written a lot on the subject of industrial safety, for anyone interested. A recurring theme is that organisations have no memory and the same mistakes get made over and over.
Anyway, this really is way off topic. Back to locks...