What we know so far about Jared Loughner, the guy who tried to kill Rep. Gabrielle Giffords and managed to kill 6 other people in the process:
He's pretty much nuts. A lot of people knew it, but word never reached authorities.
His political readings are all over the map.
He met Gabrielle Giffords at an event in 2007 and his obsession with her predates any map that may have appeared on Sarah Palin's Facebook page.
What we don't know at this point:
What, if any, influence Sarah Palin, the Tea Party or anyone else currently in the, ahem, crosshairs of the Anti-Vitriol Army had on Loughner's "thinking." There's no evidence that he even saw the Palin map. If he did, I'm certain we'll find out.