I wouldn't be too surprised if folks IN the Secret Service including perhaps even the protectee at question didn't encourage him to do so. It's reasonable to think that as a professional agent with years of experience he's probably not prone to a hysteric reaction. And since discretion is a BIG part of his job, you have to wonder if there wasn't a nudge or two in a certain proper direction.
Understand, the agent makes an excellent witness to come down hard against over reaction against Arabic individuals by airlines or others. He's the poster child of a loyal american of Arabic descent. And politics is a very strange thing at times. Politicians are certainly willing to use people to make a point. They do it all the time.
Perhaps I'm being too machivellian, but it's something to wonder about. I don't think this was a setup, but I do wonder if some political hay isn't being made.
Regards,
-Bouncer-