I think it is more like the fact the American people aren't surprised? We are somewhat familiar with terrorism now. Perhaps not familiar with the motivations, but certainly not surprised by terrorists acts...Horrified by them? Yes, but not surprised.
Which makes the administration's narrative these last several months all the more puzzling in some ways. What possible harm other than to his chances of re-election would showing integrity and telling the truth do?
I think that is the core here. Integrity. In a world of spin, they could have possibly spun these events in a way that gave the nation resolve and had minimal impact to his campaign, but they went the route of fear and decided to gloss over the issue with intentional misinformation.
Poor analogy... But most thinking conservatives weren't pissed off about Clinton getting head in a closet off the Oval Office. Good for him! They were pissed about the perjury and that is why he was impeached.
Do I think this event is impeachable? You never know. Reality is, it probably isn't. It does however potentially neuter the rest of his presidency and certainly stands to prevent Hillary from easily attaining the presidency herself.
Obama has stated time and time again on numerous policy statements about holding people accountable. It should be no different for this event either. Besides, he can always pardon them on his way out of office.