You are correct sir. If they were wearing hijabs, they could have carried AK-47s, RPGs, IEDs, suicide vests and hand grenades, and they would have been waved through.
Which is why EVERYONE ought to wear those black garbage bags while going through airports.
There is so much power in the masses as a whole, but alas, the masses tolerate a great deal of abuse before ever deciding to respond in like kind.