'...'I haven't read the entire thread yet (stopped at page 20, out of 118), so someone else may have pointed this out:'...'
Why not hand off the evidence gathered to USADA and others, where the bar of proof is lower, if only slightly, and the stakes not quite so high, seemingly. Let them do their thing, resulting in a thoroughly discredited athlete who has been stripped of all racing titles from 1998 onwards; an athlete who has consequently been chewed up in the press and whose charitable organization has long since jettisoned his name or else itself been held up to unfavorable scrutiny; an athlete, moreover, whose support has dwindled to little or nothing and whose coffers have been all but dried up by the effort to fight and survive.
Result? A soft(er) target.
The Justice Department has already done most of the heavy lifting with its investigation. Now it hands the evidence off to USADA, which handles matters from a sporting end and chops our hero down to size. When in the process certain matters of a criminal nature are brought to light, the Justice Depart is justified and indeed obligated to start a new investigation (or, if you prefer, to restart this one). When they do, it will be against a broke, discouraged, discredited person who is proven to be a liar and conspirator, one who, moreover, has few if any genuine athletic accomplishments to his name, no charity to call his own, no corporation or politician willing to go to bat for him, and far fewer fans than before.
In an interview around the time of the Men's Journal article, Armstrong said he wasn't going to contest anything anymore; and if that meant giving up a Tour title or two, that was an outcome he'd be happy with. With this, he was signaling USADA that he'd make a deal, thereby saving them the expense and trouble of a full-court press. Their response is seen in this letter: we don't want a Tour title or two in exchange for going away. We want it all. The figure standing in shadows around the corner is none other than Jeff Novitsky and the U.S. Justice Department. At least, that's how I think it will play out.