You are right - how dare they speak arabian - this IS suspicious.
I’d further advice on not letting anyone in an airplane with black hair.
In another article, it said that the passenger complained about "speaking in Arabic and acting in a suspicious manner".
Maybe the passenger was right about that behavior and maybe that passenger was wrong.
If your spouse and child were on that plane, would you want those suspicions investigated or just brushed off and ignored?
My vote is still for, "Sorry that some of our Iraqi allies were wrongly suspected but better safe than sorry."
That is why your fire alarm annoyingly goes off every time you burn some toast.
Sensitivity vs. Specificity: It is an issue with all warning systems.
If you dial the sensitivity up, over the long run for the entire warning system network, you annoy more people and you kill less people. If you dial the sensitivity down, over the long run for the entire warning system network, you annoy less people and you kill more people.
Most warning system worth their salt decide to err on the side of "annoying" rather than on the side of "killing".