This thread is addressing the overall issue of propeller safety awareness rather than solely the accident that sparked the discussion. On that note this
report, discussed in another thread has some relevance.
Although the accident clearly has a number of causal factors, the single link in the chain that was most within the pilot's power to break, comes down to safe prop handling.
Check, double check and check again, all engine controls, especially the mags before going anywhere near a propeller. Even having done that, treat every prop as live and expect the prop to start on every turn over. Use correct handswinging technique every time you touch a prop, even just for sucking in or the walkaround. I suspect the pilot was very lucky not to be fatally injured in this case.
Props and tail rotors, when running, can often be invisible and inaudible. In certain light conditions the disc simply cannot be seen even if you are looking for it, and with multiple running aircraft on an apron, noise may not provide a specific warning. Passengers ignorant of the risks, distracted and excited, are particularly vulnerable to these risks. I see some horrific bad habits around props on a very regular basis.
