The reason they came up with an underwear bomber is the same reason they came up with a shoe bomber. First they wanted to get into your shoes and then they wanted to get into your underwear. After that they want to get into your body. But job one, day one, they want to get into your head. These are stages of humiliation designed to strip you of your dignity
They just want you to accept the heavy handed behavior of the TSA thugs. They want you to agree in your mind to the need for the outrageous treatment they intend to visit on you. They want you conditioned and programmed because it is necessary to channel your fear and your hate for their purposes.
Using petty schemes to pit people against each other is one of the oldest tricks in the book. Slowly but surely boobus is being devolved into clueless zombie-slaves.