The companies probably put more and more pressure on the workers to deliver more products in the same or less time frame to reduce costs. Though those blokes seem to be just uncaring, so might not be from unrealistic company expectations.

The sad thing though is that they and other transport companies will now probably just reorganise where they load their trucks and not do it in the public eye.

I always think of the Rolls Royce breakdown system. You will never see a rolls royce being towed or on the side of the road for extended periods. The car comes with roadside assistance where they send out an enclosed truck to collect your car if it breaks down - hence maintaining the company perception of superior reliability of their product. People don't see rollers broken down, so they must be reliable cars.