You don't have to be silent, and they don't have to let you on their airplane.
"...and they don't have to let you on their airplane."
Who's they? The government? I's not their plane. The airline? They sold a ticket. That's a contract, and THEY ought to honor it.
THEY didn't like his t-shirt!!? This is so stupid and frustrating. Do like the Israelis and focus on IDing actual terrorists. Never mind the nail clippers, shampoo, Orthodox Jew praying, or non-Roman alphabet lettering on a t-shirt.
They should have just singled him out for extensive orafice searching, see how silent he is after that.