That’s an absurd analogy that predisposes one to your desired conclusion because the bridge is structurally unsound and unable to perform the task it was designed and built for, your example is NOT analogous to the Hamlin circumstances,.if you see a bridge standing and appearing structurally sound, the bridge is then fine; but then a car begins to cross the bridge, and the bridge suddenly collapses, did the car cause the otherwise ‘sound’ bridge to collapse? The problem preceeded the event, but it needed a catalys.
What would be analogous, using your bridge as an example, would be if a Boing 747 crashed into it.
Next you’ll tell us that a guy shot through the heart with a .45 had an underlying heart condition that led to his death.