If your incompetence with using something can infringe on my rights of life, liberty and the pursuit of happiness then yes some rights do need "proving" .... but really what we are debating here is the existence of revocable rights vs. privileges .... It's my belief that I and all people are born with the ability to do pretty much what they will so long as it is not a hindrance upon someone else's right to life, liberty and the pursuit of happiness.... if I was so incompetent at firearms that I could not prove my competence to handle them with a simple certification program then I should not be allowed to legally purchase them, nor should someone legally be able to sell them to me.... but say I had one given to me as a gift or inherited from a deceased grand parent, no one should be able to stop me from taking ownership as it is not a sales transaction.  If I choose to then go out and use it no one should be able to stop me assuming I am not doing something to infringe on someone else's life, liberty and pursuit of happiness ... if I prove that I was truly incompetent and irresponsible the law should throw the book at me for operating firearms while incompetent ... up to and including manslaughter (even if all I did was pull a bad version of a Cheney) but that's for the judge to decide.