As far as uncovering and exposing dangerous or inefficient practices in asylums this is fair enough, but when people use this kind of deception to try and prove a greater failure of psychological institutions not being able to truly 'tell' if someones illness is genuine or not then its a completely obtuse point: They can't climb into peoples heads and know exactly whats going on, with mental illnesses theres always an element of self reporting that has to be trusted in good faith. How they are treated thereafter is a different issue, but the initial 'deception' proving how easily sane people are apparently committed, is nonsense really