Why Undivided Was Not Released As First Single

so let's say the decide to make "undivided" as the first single but what will be its video like? how can they make a video about it? While the planes are crushing to the towers, or while the towers were going down?who can stand to watch the video?
it'S true Undivided is a great song, even the best song they've written from these days, but it reminds the days after the crush...those were bad days for America...
we can be more thoughtful, can't we?
but if they can make a good scenario for the video, i , too, want them to make the undivided the second single)))))