You are misinformed. When people carry concealed crime numbers drop because criminals are also scared to die and only want easy targets. And you won’t see the gun if they’re carrying concealed so the class of people you’re talking about, open carrying and brandishing, are not the same people concealed carrying.
Well you can’t get a concealed carry permit in Europe, and you cant compare two countries like this, where one has extreme gun control and the other doesn’t and then further go on to compare crime rates. This doesn’t even fit into the proper definition of experiment, where’s the control?