Graham Hancock insists that his ideas aren't being taken seriously by the archeological community because they find them too threatening, rather than for the real reason: that they think he's plain wrong.

In this view, archaeologists "know" that he's really on to something, but refuse to look closer. He's claimed to have been "banned" from Egypt (which might even be true, I don't know). The whole vibe is this is the truth that THEY don't want you to know.