I know I am a little late responding but here it is anyway...
Is deception by the media ever justified? Well I would like to say no, but there are some cases that I believe deception should be applicable. I mean, of course I would like to know the truth about what is happening in the nation, but due to the safety of the nation, sometimes things need to be withheld.
I believe that the NY Times was in the right to hold the NSA wiretapping story for a year. When the President decided to wire phone lines, he knew that it was not just an internal problem. By wiretapping the government was able to find information that was connected to the terrorist attack. If the NY times would have printed the story, then the source of the information would have been out. I think that for the safety of the country and for the need that the nation had for the information they were receiving the story could not have been printed.
No one likes to be decieved, but sometimes it is the best for the greater good.