I will try one, and definitely last, time.  It's not about the rulebook or the airplane or even the maneuver.  It's about the pilot.  I don't care if you are doing 360 overheads or barrel rolls or landing on short runways or flying in conditions where ice is possible or any of the other things that involve calculated risk.  The ONLY thing that determines whether the flight is being conducted safely is whether the pilot has prudently assessed the risk -- for him or her, in that airplane, on that day, in that place and in those conditions.  If you think that following all the rules or flying "safe" airplanes or never doing any maneuver that isn't "standard" makes you a safe pilot, do yourelf, your family and all the rest of us a favor: tear up your licence and never fly again.  For the rest of us, PLEASE, don't ever stop asking yourself if the judgment you are about to make (whatever it is) is a safe one.  If the Glassair pilot had asked himeself that question (and given himself an honest answer) he could not possibly have done what he did.