What other possibilities are there not covered by 1 and 2?
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A third and very obvious one, namely that the U.S. did do it but the Delaware Dunce hasn’t been informed of that, and for good reasons. It’s called plausible deniability!
RE: A third and very obvious one, namely that the U.S. did do it but the Delaware Dunce hasn’t been informed of that, and for good reasons
That’s still covered by possibility number 2.