I mostly was going for software mistakes in the last century or so, not natural disasters before we had reasonable tech to protect ourselves. But even in the case of Pompeii, the residents knew that Vesuvius (likely etymologies include "unquenchable" or "hurler of violence") was an active volcano, so human negligence isn't unreasonable there.
My claim is mostly that "human negligence" is so universal of a root cause that it's meaningless. What form of human negligence happened, and how could it be averted in the future?