I hereby assess the risk as "nominal". Let's move on... or have we become so anal and politically correct that we actually give credence to such nonsense?
Like any motorsport event, if you are there, you accept the risk. If you don't want to take any risks, wrap yourself up in your feather duvet and don't eat your food with sharp implements. And never, ever go flying, because who is to say that your engine will not fail and you will, as a result, crash into a school, killing hundreds of innocent children?
Nothing is without risk, despite what the fun nazis would have you believe...