LJ,
I do not disaagree that an appropriate harness would make a HUGE difference. However, helmets also have the potential to save lives.
Following is a quote from a fairly recent accident report with which I am sure we are all familiar ( and YES I know harnesses were an issue here too!)
The FSP wore a headset24 provided by the commander, and the commander wore a Campbell Aero Classics hard shell flying helmet with integrated goggles. The RAFCAM report stated that had the FSP been wearing a protective helmet, it is possible that the protection afforded could have reduced the severity of his head injuries