Definitely a tragedy, but race support is necessary.
I know that in races 25 and 35 years ago we were having these problems. I can remember a couple of riders hit by officials, and this was with far fewer motos. Everyone volunteered, so there sure wasn't any training. Occasionally, well intentioned officials contributed to an accident in some way. We also had completely oblivious cars going the wrong way on courses, and other mind-bogglingly dangerous conditions. We had spectators wandering out, drunks, people with hoses, dogs, cows, oil slicks, thumb tacks. Vehicles served as bailouts, generous technical supports, and -importantly- volunteer "ambulances." Motos, race cars and the like absolutely helped make it safer, despite the accidents.
I applaud all the calls for safety, regulations and enforcement. However, cyclists will get hit by moving vehicles, even in races. This is a dangerous sport, and on-course officials are part of the solution, not just part of the problem!
RIP, fellow rider and racer. God bless his family.