Before retirement, I was a LEO for thirty years, much of it in plain clothes. I could never understand plain clothes officers that would go into restaurants, stores, etc with their sidearm, badge, etc showing. Far as I could see, it just said, as has alreadfy been pointed out, shoot me first. IMO if an individual has a ccw permit, the idea of wearing a badge, star, whatever, falls into the same catagory.