They know he's full of crap (and drugs). He's giving up because he knows he's dirty.
Like I said, they're convicting on a hunch. Seriously, who wouldn't give up after 10 years? When passing every test isn't enough to prove innocence, there's not much you can do except argue until you're blue in the face. Which Armstrong has done, and now he's tired of it.Again, I think he cheated, too. But I also don't like seeing accomplishments get stripped when there's no proof of wrongdoing. Seriously, why don't we strip every winner in every sport of their titles, even if they tested clean hundreds of times? They're just too good to be clean!