We live in an era where a few brown-skinned men praying on an airplane is enough to trigger passenger panic and the involvement of the FBI. Do you really think that, if the above happened and the passenger was unfortunately of the wrong race, that passengers would not immediately jump to the "terrorism" conclusion? In the last few years passengers have jumped to that conclusion for way less.
[edit] I'm not saying this would've meant throwing someone into Gitmo and throwing away the key. But you have to admit, if this happened to anyone of Middle Eastern descent, there's not a chance he wouldn't have been detained and subject to a barrage of investigations.