But there are lots of horses, they all need checking... there are rules to be followed. Same is happening for all the mines and some seemed to be picked on - well they all are!
That's why History is a subject at school and university, we need to learn from mistakes of others, and if they can find just reason to question maintenance practices in the one that had the failure - there was a reason they were descending early... then they need to prove a failure had occurred. And they could occur somewhere else too. Not many alternatives up in the sky with a fire.