Well in that case it WAS built with multiple safety mechanisms and failsafes, and it was deliberate human actions that caused the catastrophy.
So escalators are a good example, human greed is the bad example.

And what, we get the one universe he writes without a cool magic system?

Plot twist: its because they never properly cleaned the prep area, the fridge was too warm and the employees didnt wash their hands regularly when switching between the cash register and food handling.