Ian W, I am not sure about your ANY obligation. how about a moral one? after all 239 souls have been lost. this isnt some ambiguous spying/ eavesdropping/whistleblowing event where claiming national interest is the usual default option. what could be more of a national interest than to help to find out what happened to 239 lives by declaring what you know or dont know? non-disclosure leads to distrust and conspiracy theories which may be entirely unjustified. agreed that "those who need to know" probably know by now but making the public wait for the final report which could be light years away doesnt seem a good
pr move.
that said, I am not yet ready to believe that the good folks currently investigating this mystery are colluding in withholding information. as with the law of the sea, I am sure the law of the air is in full operation to find this aircraft.