IMO the test should be less of the "does the public have a right to know this", and more of, "do the authorities have a right to keep the public in the dark about this". I'm a great advocate for privacy, but if you do something indiscrete and it is known by those not involved, then it is already public knowledge. There should be a better reason that the individuals involved wantng to keep it quiet for a block being placed on the common people knowing about it. Is national security involved ?