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Many entities have sanity-checking tools. They fail. Many have careful developers. They fail. Many have automated tests. They fail. And so on. Disasters happen because all of those will fail to work every time and therefore all will fail some time. If any of that sounds improbable, as if there would have to be a veritable malevolent demon arranging to make every single safeguard fail or backfire (literally, sometimes, like the recent warehouse explosion - triggered by welders trying to safeguard it!), you should probably read more about complex systems and their failures to understand how normal it all is.