Even if you could find statistics like this, they would actually prove that OC doesn't prevent crime, it only postpones it.
I'm ok with that. Criminals are going to commit crimes, thats what they do. If I can postpone a crime by having a firearm visible, and it keeps me out of a bad situation, I would consider that a success.
Lets say Im in a parking garage, late at night, walking to my car. To a BG Im just a regular joe whom he might consider a target. What he doesnt know is that Im carrying a concealed firearm. In order for him to find this out I would have to be in a
life threatening situation. Not to sound like a wuss, but I would like to avoid any life threatening situations whenever possible!
If that BG were to see that same regular joe,
with a big gun, in a parking garage, he might decide to pick a different target. Life threatening situation avoided
I personally dont open carry, but more times than not I think you would be better off having your weapon visible as to discourage any potential BG's. That being said, I definitely see certain situations where the element of surprise could be key.
So what is the best solution? Simple... one on the belt and one in the boot. Best of both worlds. If your OC gun is not enough of a deterrent or gets taken, you still have the element of surprise on your side. 2 = 1 and 1 = none.. or something like that