Prevention v mitigation. I believe that becomes a smoke screen - any safety program involves both. Drive your care safely, obey the traffic laws, but wear a seatbelt and have airbags. Handle tools carefully, restrict access, but still have workers below you wear hard hats. On and on and on. We use the safety device just for the instance where we make a screwup. The lady certainly made an error by running over the pipe, but that isn't the issue! The issue is helmets. Would the helmet have helped? Might my helmet help me in a mishap?
Here is a clear instance where no X-thousand pound vehicle was involved. Speed didn't seem to be (yes, I said seem) the culprit. She possibly made an error in riding over the pipe. Might the helmet have helped? That is the question, NOT her riding skills. Prevention is a different discussion - parallel, but different.
By deflecting the discussion from the potential safety benefit (mitigation) of a helmet to focusing on riding skills, you defeat your own argument!! Because who else would better need a helmet than someone that might make a riding skills mistake? I certainly fit in that group, and I suspect most of us might...