To what extent should Barnes and Noble be held responsible?

The Optimist: Apparently, Barnes and Noble has apologized for the incident, but also said they believe it was not an employee that did it, but a customer making a cruel prank (who knows). But its one store in one city of a nationwide chain. Can we really allow this one occurence to reflect the entire company?
Let's be clear though, if Black people were to boycott every business that has committed a racial slight at some point, we would eventually have nowhere to spend our money (and that includes some black-owned businesses)! Does anybody have a bank account?? Chances are, your bank has documented ties to slavery. And let's not forget, its a book store. Of all the things to be boycotted, should bookstores be on the top of the list?

The Pessimist: I will not shop at Barnes and Noble or any of their affiliates! I am a confirmed bibliophile and have spent hundreds (or probablythousands) of dollars at your stores and their affiliates over the pasttwo decades. I just received this link from my sister in New Jersey.... After seeing this merchandising display in the link below, you canbe assured I will not shop at Barnes and Noble or any of theiraffiliates! You can also be assured that I will pass a copy of thise-mail along to as many people as possible, including the members ofMoveOn.org and any other large group of people who might also be outragedby this blatant and malicious characterization of the First Family. You have allowed your employees to orchestrate a racist display under the guise of "merchandising"! Enough is enough. Barnes and Noble should be held responsible for allowing such an act to happen.

The Addled: Barnes and Noble should fire the Manager and employees on duty at that Florida location. They should also look into the caliber of people that they hire. But I don't believe that the actions of these people reflect that of Barnes and Noble. They were not acting as representatives of B&N, but on their sole beliefs. This act was a cheap shot at trying to demean our president and the African American people as a whole. It is undoubtely racist, but we should not punish the company as a whole, just those involved in this heinous act.