A race without risk mitigation would not, by definition, be competently planned. RBAR without risk mitigation would be me and some mates jumping into some souped up aerobatic machines having never done anything like it before in our lives and "having a go". Might be great fun, and might even be interesting as a spectator sport, but it would be incredibly risky compared to the real RBAR. The argument here is not really about whether there is any risk mitigation it is about how much should we accept. The organisers and pilots obviously accept what is in place at the moment, some here think there should be more, whatever, if you do much more to reduce risk you end up taking away anything interesting about it. Hey, lets do it at 3000', and why not put a 4g limit on it. Lets prohibit bank angles greater than 45 degrees and pitch angles more than 30 degrees. And lets make the aeroplanes two crew, and ensure there's a toilet in case the guys need a break mid-flight. I think that as it stands it is no more dangerous than an airshow, and that is as it should be.