I think companies have really just got to come down harder on reckless operators.
The problem with idiot proofing everything is they just invent a 'a better idiot'.

These sort of accidents are usually a result of distraction or excessive speed. I'm not saying in any way this is the case in this instance but I've had a few sites where it's the employer who needed to have a long hard look at itself, it's easy to blame the operators when the company has an ethos of 'work harder, faster NOW!' or a company that didn't really care about it employees so the same care is paid in return by staff.