One gets a similar feeling to know there appears to be a large group of pilots, apparently uniquely American, and from one particular large airline with an eagle on a silver tail, who are professing complete ignorance to any limitation on being able to mistreat aeroplane controls without having structural failure 'as long as you are below Va'. Large airliners are not F16s, and treating an airliner rudder as if you are flying a Pitts Special with multiple rapid reversals is just not on. What is more frightening is there appears to be an airline full of pilots who can only point to 'design defect' and not recognise the real cause. Your picnic, whatever it is, needs to be a comprehensive breakdown of how to handle unusual attitudes and recommended techniques on the controls.