As I see it, this is what traders do all day long — and especially what they’ve been doing since the subprime mess burst upon the scene. They have seized upon a fairly bad situation: a stunning number of defaults and foreclosures in the subprime arena, although just a small part of the total financial picture of the United States. They have then tried — with the collaboration of their advance guards in the press — to make it seem like a total catastrophe so they could make money on their short sales. They sense an opportunity to trick other traders and poor retail slobs like you and me, and they generate data and rumor to support their positions, and to make money.
MORE than that, they trade to support the way they want the market to go. If they are huge traders like some of the major hedge funds, they can sell massively and move the market downward, then suck in other traders who go short, and create a vacuum of fear that sucks down whatever they are selling.
Note what is happening here: They are not figuring out which way the market will go. They are making the market go the direction they want.