Piffle!
Treason is a direct action with the intent of offering aid and comfort to the enemy. If anyone is newsworthy, its OBL (Piss be on his name). Further, technically speaking, we are not at war. Only Congress can declare war.
Further, though we have good and valid reason to believe that OBL is guilty, we really have little in the way of solid, “smoking gun” stuff. Clearly, this is no problem to you, but the rest of the world may have different evidentiary standards. Now, I hasten to point out that I think he is probably guilty.
Suppose he were to say something like, yeah, I did it, screw you, America. Something that would convince the doubters world-wide (believe it or not, a great many people overseas think it was all an Israeli plot!) Surely that wouldn’t be treasonous, would it?
What the hell have we to be afraid of? Let him shoot his mouth off, so what? Your kind of approach would lend uneeded credence to the idea that we fear what he has to say, as a liar might fear the truth.