OC is not on my list of things keeping someone from attacking me. Heck, plenty of uniformed police get attacked and they are as OC as you can get. If you look like a sheep and carry yourself like a sheep, displaying a handgun isn't likely going to change that. Displaying situational awareness and looking like a tough target regardless of visible weapon will keep riffraff away. But to each their own.
OC civilians are not try to arrest bad guys.