I'd imagine they were singled out because we've had quite a few high profile terrorist attacks committed by people claiming to be muslims.
Most of these attackers were ethnically either arabic or descendants.
Pretty sure the above statements are merely facts so calling me a racist on those points wouldn't make much sense but if you gotta you gotta.
Anyway the person reporting the siblings probably imagined they were planning an attack which doesn't make much sense considering how stringent the security at airports is.
Which is why I said that it was wrong
People will bring up Breivik and say well why don't we profile all white people.
Because it was a single incident, now if we had a Breivik styled attack every few months, involving a few white people at a time, I'd find it completely understandable if people scrutinised white people as a result and singled them out more.
Hell, when a muslim or anyone who isn't white is murdered and the attack appears unprovoked like the death of that imam and his colleague recently, people are quick to assume it's a hate crime by a white person.
And it's completely understandable why that is people's first line of thought.
We're conditioned through our media and experiences, which for most people doesn't extend past their tv and computer.
Again, I wish this wasn't how things are, but until things improve too people will have stereotypical views of others.