A story can't be killed if it has ten comments on it. You were one away. I asked a question that died with 61 points. But knowing that it only takes 10 flags to kill a story, I wouldn't be surprise to know that AirBnB has ten diehard supporters.
I'm just a supporter of a crap-free HN. Thus, I flag stories that don't add anything new to the discussion. I know there are at least ten others like me...