I listened to the Professional Subordination cast this morning and I finally found the word I was looking for whenever I hear the phrase "murdering the unchosen alternative". What you really mean is to deceive everyone into thinking that the chosen alternative was the only alternative there ever was.
I don't understand why one would think this strategy is better than coming straight out and saying that Option A was chosen over Option B. The rest of the cast makes sense. I can see the necessity to carry out the organizations decisions even when they are contrary to my personal beliefs. But, trying to hide the existence of Option B is a lot like trying to hide bit of embarrassing info during a job interview. It just makes the interviewer dig deeper to find what you're hiding. And in the real world, such deception just undermines your credibility.