Which I am absolutely positive had nothing whatsoever to do with his being any threat to the safety of his fellow passengers or the crew of an aircraft.
THAT incident was solely about TSO's punishing a passenger who had the gall to mock them. Retaliation for being a smart-a** is quite common with the TSA; they will often even admit up front that they punish passengers who talk back. The shirt was specifically designed to mock the TSA's "security theatre" -- I think it is telling that if he was THAT much of a threat, why was he not turned over to law enforcement?