I concur with Slidin and others. Back in the early days of quickbuilds there was little regard for safety. I attended/helped at a couple in the '80's, though I didn't have a lot of construction experience. They were astonishingly poorly organized and accidents could very easily have happened (I didn't personally observe one).
Nowadays, it is entirely different. The work goes a lot slower and safety is paramount. They have meetings prior just about safety, they have safety training for all participants, people assigned just to safety, the works. Yet there are still accidents and injuries. I feel for the woman injured, and am glad she wasn't hurt as badly as the OP seemed to imply. Being 'crushed' by a falling wall suggests a serious or even fatal injury, which wasn't the case, thankfully.