Nothing To See Here
Twenty weeks of training to get the badge. After that, no obligation to record what you do with it, and no external mechanism that will notice a pattern unless someone already knows which pattern to look for.
The Doors Were Locked From the Outside
The people who died at Imperial were not killed by fire. Fire was the mechanism. They were killed by a padlock, a vacant inspector's job, and a state philosophy that said prosperity would trickle down to the people standing in the water on the kill floor.
The Assumption at the Center
Leadership changes. Architecture persists. A system that functions only under benevolent leadership is, by definition, unstable.