Security Theater, Act IV: Abandon all hope, ye who enter here
A part-time security researcher works out how to create some nifty MacGyver-ish weapons from items allowed in airport secured areas and, good guy that he is, supplies this information to the TSA and the FBI. The TSA ignores him and the FBI visits him to ensure he didn’t do his research in an airport.
Apparently no one is concerned that a jihadi ner-do-well could replicate this on a plane filled with folks heading home for the holidays. Somehow, this just seems typical to me.