is by an Indianapolis police officer who is relating his experience with investigating criminal disarms (successful and unsuccessful) while open carrying and concealed carrying. He notes key factors in both OC and CC gun grabs.
Go read for your self, but he makes an interesting point about gun grabs happening within a certain area, and that most people who OC (or otherwise) don't travel in those areas:
You can swim in a pool with a bloody pork chop around your neck your whole life and never have a problem. Might be different in the ocean, though.