I concur with the uncomfortability. At least the infringement is on a specific sub group, and not the populace on whole, but I share the concern on some 3rd party determinant of mental stability. So, my question still needs a guide......how can we best identify the mentally damaged, pathologically inclined folks, as to deny them, and them alone , from accessing anything dangerous, be it firearms, axes, swords, hammers, power tools, cars?