John Mohammed was using the national media to communicate to THEM.
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Communicate what? How to get your behind thrown in the slammer while awaiting execution.
HEY ALL YOU 5%S, LOOK AT ME NOW
John Mohammed admired 19 Islamikazis who flew into builidings, and thought there should be more. A cozy (compared to a Caprice) prison cell and years of having a platform ala Mumia must seem even better to him.
"What's in it for him" is a foolish and naive way to understand what motivates these maniacs.