P95Carry, if you run Murphy's Law out, ALL accidents have a negligence component. An "accident waiting to happen" isn't an accident, it's just an unsafe situation somebody with knowledge and foresight can recognize.
Murphy just restated the law of unintended consequences and said, quite rightly, that ANY condition not properly considered that can lead to an unforseen consequence of a pernicious nature will happen. He was an engineer, and astutely made his observation, which unfortunately is not given the serioius due it deserves.
Negligence has degrees. If a person is aware that a dangerous situation exists yet does not act appropriately to ameloriate the potential harmful consequences, the foreseen event is due to negligence.
If there was no awareness beforehand, it is an accident.
Something that may be attributable to me as negligence may well be only an accident for somebody else. The criterion is awareness of the potential consequences. So, I suppose a gun firing when an untrained child gets ahold of it is an accident attributable to the negligence of somebody else. If that's you, and you're 4 states away at the time, would you say YOU had a negligent discharge? No. You'd have to say the child had an accidental discharge.