That is a simple question to answer: they’re Muslim. They know something awful is going to happen, and soon.
They do not want to be blamed. They also do not want to be a target after the “awful thing” happens, either by the target country or by the perps.
Why else do you think President Karzai is telling the US to leave Afghanistan IMMEDIATELY!!
Do you realize what would happen to anyone who even looks like a Muzzie if a nuke was detonated in the US?