The only problem I have with it is tipping off the bad guys as to who is carrying.....
And that can be a good thing or a bad thing.
Let's look at what was posted earlier.
We had a store robbery here almost twenty years ago. If I remember correctly the bad guy didn't announce the robbery, just simply shot two people upon walking in. Both survived, but severely injured. In another bank robbery story some years back in another town the robber walked straight up to the teller and shot and killed her. Carrying concealed makes little difference if your the first one shot. Do I want to trade round with a person who's obviously armed? Take that risk? I have more questions than I do answers.
That tells me that if the same situation were happening today the open carry person better see the bad guy first or he/she openly carrying will get shot first.
In both cases they shot obviously unarmed people, would that have played out the same way had someone been openly armed? I don't know but seeing armed people in an business where you plan on committing a crime is definitely going to make you put your thinking cap on. Am I willing to trade rounds with an obviously armed person? Would I go ahead and commit to the crime knowing that? I have more questions than I do answers. Is a person more likely to commit a crime in front of an unmarked patrol car or a marked one?