Like anything, no single factor ever ends up causing something like this. Were the crew at fault? No doubt. Was the system at fault? Obviously. It's a sad reality of this litigious world we live in that accidents no longer "just happen", there has to be someone to blame. If you want to argue semantics, or percentages, go ahead, but to place the "blame" fairly and squarely at one or another persons feet is not only unfair but also wrong.