This really puts the banana in Republic.

Why The Truth About 9/11 Is Censored By The Media

If the government's account of 9/11 is not accurate, wouldn't the media have been "all over it"?

Isn't the fact that most mainstream media sources don't spend much time covering these issues show that there's nothing there?

No.

Self-Censorship by Journalists
Initially, there has been self-censorship by journalists.

Several months after 9/11, famed news anchor Dan Rather told the BBC that American reporters were practicing "a form of self-censorship":

"there was a time in South Africa that people would put flaming tires around peoples' necks if they dissented. And in some ways the fear is that you will be necklaced here, you will have a flaming tire of lack of patriotism put around your neck. Now it is that fear that keeps journalists from asking the toughest of the tough questions.... And again, I am humbled to say, I do not except myself from this criticism.
"What we are talking about here - whether one wants to recognise it or not, or call it by its proper name or not - is a form of self-censorship."

Indeed, journalists who have even asked innocuous questions about 9/11 have been threatened.

And, referring to another topic, a leading MSNBC news commentator has said that there is self-censorship in the American media, and that:

"You can rock the boat, but you can never say that the entire ocean is in trouble .... You cannot say: By the way, there's something wrong with our .... system".
As Air Force Colonel and key Pentagon official Karen Kwiatkowski has written (at page 26):

"I have been told by reporters that they will not report their own insights or contrary evaluations of the official 9/11 story, because to question the government story about 9/11 is to question the very foundations of our entire modern belief system regarding our government, our country, and our way of life. To be charged with questioning these foundations is far more serious than being labeled a disgruntled conspiracy nut or anti-government traitor, or even being sidelined or marginalized within an academic, government service, or literary career. To question the official 9/11 story is simply and fundamentally revolutionary. In this way, of course, questioning the official story is also simply and fundamentally American."
Censorship by Higher-Ups

If journalists do want to speak out about 9/11, they also are subject to tremendous pressure by their editors or producers to kill the story.

The Pulitzer prize-winning reporter who uncovered the Iraq prison torture scandal and the Mai Lai massacre in Vietnam, Seymour Hersh, said:
"All of the institutions we thought would protect us -- particularly the press, but also the military, the bureaucracy, the Congress -- they have failed. The courts . . . the jury's not in yet on the courts. So all the things that we expect would normally carry us through didn't. The biggest failure, I would argue, is the press, because that's the most glaring....

Q: What can be done to fix the (media) situation?

[Long pause] You'd have to fire or execute ninety percent of the editors and executives. You'd actually have to start promoting people from the newsrooms to be editors who you didn't think you could control. And they're not going to do that."

http://georgewashington.blogspot.com/2005/10/hit-them-with-truth.html