The husband was on his way to a confrontation with these 14 Syrian "musicians" and the stewardess told him this to calm him down. I'm not sure if it was the right decision, but she had to make it. Why are you sticking up for the Syrian musicians? Are you Syrian?
If everyone on the flight was as spooked as the writer implies, then the FA made a judgment call that calming passenger panic was the overriding concern. That said, who is to say that the FA wasn't talking to the Caucasian ring leader. Very bad form on her part, but she was probably shaken to the core.