I doubt this will even get read given the number of comments already. But after reading some of the shit here, it needs to be said.
What happened here was completely unacceptable. These people were clearly thrown off because of their appearances. The posters who have said that wearing traditional Muslin dress is a "kick me sign" or stupid need to GTFO of my country if you're here. This is AMERICA. You're supposed to be able to be whomever you want, and be treated fairly regardless of whom that turns out to be.
I'm white. I'm about as boring and typical as we come in appearance, and if I had been on that plane. I would have told the idiot to calm down as there's no way a family of 9 are terrorists, or that terrorists attempt to survive their bombings by relocating to a different area of the plane. I would also have asked the family to refrain from talking about a sensitive subject given the reactions of other passengers. And when there people were removed from the plane, I would have left as well and I will never fly them again.