Proving one is innocent?
There’s a great concept!
I think the real guilt for Lance is that he is American. It’s quite fashionable to trash Americans these days and to have an American so completely dominate a sport event that "belongs" to Europeans is simply too much for some to take.
Maybe Lance is a doper, but so far, no evidence to back it up, so one is left with allegation after allegation and the need to "prove" one’s innocence to those in a conspiracy mind set.
Mix that with generic anti-American prejudice et voila, the need to appear before the international criminal court in company with fellow Texan Gee Dubya!