Many philosophers like thought experiments; ethicists really like them. You know, the "say-you-are-on-a-desert-island-with-enough-water-just-for-you" variety of thought experiment.
So here's one:
In going through the confiscated tapes and videos of the passengers of the Mavi Marmara, you see the video of an execution of a Turkish passenger. The execution, on the face of it, not only contradicts the IDF's official verson of what happened, but it pretty clearly shows a serious violation of IDF code of ethics reports. If you release this video, however, you undermine the credibility of Israel's hasbara attempts, and you invite international condemnation, that could be construed as a threat to Israel's security. Lying ot the public for the sake of security is a time-honored tradition in many, if not all, countries.
What would you do?
It won't do to answer,"The scenario is impossible," because there is well-documented and undisputed evidence of such behavior on the part of all soldiers, including Israeli. One doesn't need a Breaking the Silence handbook of testimonies for that.
Nor will it work to say, "Such a cover-up will be discovered" because many cover-ups are never discovered; sometimes they are revealed by a historian fifty years later.
So what would you do?