Which may have been fine if other supports were taking the load. Visibly rusted parts are easy to diagnose, thus if that particular part was unsafe it would hav

Which may have been fine if other supports were taking the load. Visibly rusted parts are easy to diagnose, thus if that particular part was unsafe it would have been quickly deemed as such. It could be that it contributed to the collapse, but that it alone wasn't enough to justify it as unsafe.