Sorry, Bruno, your post must have gotten cut off right around the part where you actually supported your assertions with anything other than more assertions. Repeating over and over again that the policy can't possibly reduce the likelihood doesn't make it so, especially since we know that a vast majority of the robberies are covert, so the use of an inconspicuous disguise including hats, sunglasses, etc. is important.

It's totally intuitive that taking steps to prevent people from hiding their identity in a bank would reduce the ability to execute a covert robbery, and there's anecdotal evidence that this is, in fact, the case. The tin foil hattery in this thread is really something to behold. If you guys spent one tenth of the time worrying about the real abuses the banks are engaging in instead of worrying about whether they make you take off your hat, we'd be in much better shape.