My thoughts are that you are literally pulling a conclusion that the numbers don’t support out of your ass because you ‘feel’ the numbers are probably higher. The entire premise is flawed from the beginning anyway, because any situation where a person pulls a gun on a person without a gun is not a defensive use of a gun, and certainly doesn’t make anyone involved safer. Any interaction between two gun wielding individuals is similarly not a case of a good guy preventing violence. If neither had guns, neither would get shot. It is literally that simple.