You made a blanket statement (joke or not) about disabled, elderly and children being ineffective in using guns. This is the very definition of discrimination, a cardinal sin in liberal view.
There are many degrees of blindness. What prevent a paralyzed person in a wheel chair to shoot a gun?
Even if a person is completely blind, I would not want to deny his right to defend himself using a gun with his hearing. This person may need a gun more than I do.