I'm not a leo or have any training in that area, but I am a study of human nature. I beleive that a guy that is going to commit murder in a criminal activity is not going to care if I am concealed or not. I think that most criminals are lazy and don't want to work for their money and don't want to deal with an armed population. I could be wrong but I think most criminals would pass on the situation because of the risk and work that they would have to put outto tangle with an obviously armed citizen. Why else do we put bars on windows and alarms on doors. To notify criminals that they are going to have to work to steal your property and just move along. It obviously works most of the time, doesn't it?
Do all the bars and whistles stop all criminals all the time.....no. By showing you have a gun you have lost the element of surprise. OK, so lets say instead of shooting you the bad guy singles you out pre-crime to take as a hostage, hit in the head, tie you up, etc, etc. Or, what if you're standing in a bank and Mr. 1 in 1,000,000, the one guy who is willing to kill somebody, walks in and sees you wearing a gun.......then what. If you are going to carry a gun for personal defense it would behoove you to get some training before carrying. If you are carrying it as a "show of force" of sorts, carry a baseball bat......by carrying openly you have lost many of a the advantages of carrying a gun. Not only is it illegal to openly carry in some states, it WILL draw a lot of attention to you from everybody, and thats not something you need or want in a hostile situation.