Individuals who open carry are not the ones law enforcement should be worried about. By open carrying, those doing so bring immediate attention to themselves which is something those with evil intent would certainly avoid at all cost. Thus, concealed carry bring ZERO attention, why open carry?
Consider a person stopping to pump gas late evening or round midnight in a not so great part of town. A couple of pumps over, you have a thug contemplating a thump.
The open carrier turns to pick up the pump handle, exposing the weapon in a holster....the thug sees it, the two briefly lock eyes.
You've just thumped, the thump. It is likely the perp will go about his business...to live for another day.
For every instance of concealed carry, I can think of an instance to open carry....and I've not open carried once. I prefer concealed, but fully support those who carry openly.