Only takes one what??? and having insurance which I have is not going to stop my quad crashing I dont fly silly because I have insurance and I am sure the guy who died flew in a similar vane, there have been many incident with model aircraft be they planes cars boat helecopters quadcopter and the like with a fair few injuries no dout but it wont be the last time someone is injured as long as everyone thinks and act sensibly then incidents will be reduced.
the only problem you have GAZOU is you can`t control the airspace over Gazouland so someone can take off from the field next to you and over fly your show and there is nothing that can be done as long as the person in control of the craft dosn`t break any local laws which if they do then they deserve the full force of the law comming down on them.
Regards Mark.