A container ship hit an important bridge in Baltimore, and the bridge collapsed.

The bridge was not designed to survive such a collision, as such large ships did not exist when it was built.

What caused the ship to go off course. and whether that was anyone's fault, is a side issue. Accidents will happen and mistakes will happen. We should design systems so that mistakes and accidents won't turn into disasters. The replacement bridge should be designed so that ships traveling near or under it cannot possibly damage it no matter what strange things they may do.