Is it ever acceptable for a journalist to deceive? Well, most certainly. In fact, my policy is truth is never the, um, best policy...um...yeah? No, no. In all seriousness, I have grown up knowing how important honesty is, but I've also grown up knowing that sometimes you just have to lie. Yep. If I didn't want to go to school one day, of course I lied.
In my mind, deceiving is different. Deceiving, although associated with such terms as betrayal, is something done that does NOT necessariliy cause harm to another. So sometimes deceiving is necessary. Fabricating in a story, not acceptable. But one example of deceiving may be hiding some information from your editor about a story, like a quote from an individual. It doesn't hurt anybody. Am I clear? I feel like I'm rambling. Basically, I guess deceiving is okay in certain circumstances. Make sure there will be no victims and that it's absolutely necessary.
Now, let's apply this to the wiretapping incident. Does it hurt anybody? Not physically, but I imagine people were pretty shocked when it came out that it had taken an entire year. In this case, I do not find it acceptable.