SAR at Bizarre Bigfoot has a piece on the government's knowledge of Bigfoot. If the government knows BF exists, why the secrecy? That's a big question. I commented over there that, being a cynical person when it comes to government, the cover-up -- and I believe there is one -- isn't to protect the creature, but protect the system. In part, anyway. Who knows, we sure don't.
If you've read any of the Missing 411 books by David Paulides, one has to entertain the possibility of a Bigfoot type creature responsible in some way for the disappearances. Maybe. Now, I do not want to imply Paulides says this -- he doesn't. Any speculation along those lines is mine. This is all assuming Bigfoot is more than just a "flesh and blood" creature.