One instructor I had, for what was actually a 2 day course on concealed carry, was a police officer for a large metropolitan department. He told us that gang members and criminals in his area would work in groups and target single people they believed to be carrying, concealed or otherwise, to steal their firearms. I didn't get the impression he was making it up.
I've had numerous officers tell me that one of the biggest differences they've seen over the course of their careers is that police presence is no longer the deterrent it once was. Whereas once they would show up to a scene and people would retreat from what was an armed presence of authority, the reaction of bystanders was now to take out their cell phones and get right in the faces of the officers and to close to distances well within the 21 foot rule. To me if you're working under the perception that the appearance of you being armed will deter a threat, I think you're mistaken.
I have also seen firsthand a woman in a force on force scenario draw on two men who closed on her and eventually shoot one of the men despite her carrying concealed. She was not at the time being attacked, and in the scenario had she not drawn they wouldn't have known she was carrying. The end result was she killed one of them when others passed the scenario without ever discharging their firearms. Displaying and presenting a firearm into an engagement raises the threat level when at times you might be able to walk away. Carrying openly might take away that opportunity.
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