Because some things are fact, such as cocaine residue in Egyptian mummies, doesn't mean everything is fact, such as aliens building the Giza pyramids. I would be sorely disappointed if Kennewick Man, for instance, were reburied without further scientific examination (and yes, I know all about the restoration of bodies to the native peoples and all that).

We know so very little about our past! I, personally, think that my ancestors were pretty smart and savvy folks to survive as they did, not needing help from space aliens or Elvis or anyone. What I don't like is entrenched academics and others saying that because it doesn't agree with their current thinking it didn't or couldn't happen.