WildRose, you hit the bulls eye on this one. My view is that you completely defeat the purpose of concealed carry by advertising that you are doing so. I believe that most bad guys are far more experienced than I am in violent confrontations; Therefore, stealth and surprise are my two biggest advantages. If you want to advertise that you are carrying, why not just open carry?
One of my concerns is that if I become involved in a public large scale incident law enforcement arriving on the scene could mistake me for one of the bad guys and put down me down with friendly fire. Something issued by the state that could quickly be displayed, is highly visible, and instantly recognizable by law enforcement identifying a person as a responsible armed citizen would be of great value in this scenario. My emphasis here is “issued by the state”, that way only people with valid concealed carry permits would have access to them.