It's worth remembering that Armstrong, at least initially, was as much of a victim as his alleged victims. Festina weren't the only team doping in '98, and USPS weren't likely to be the only dopers of '99.
Armstrong and Bruyneels logic was sound. If you want to succeed in a corrupt system, you have to be corrupt, and you might as well do it properly, especially because you don't know what everyone else is doing.
The depth of the darkness that ensued is, I think, attributable to the riches that Armstrong brought with him to the world of pro cycling. Once you are on that train, how can you get off?
Still, he sounds like an utterly nasty bastard, as opposed to just either thick and/or greedy like many of the other players.
I really want the UCI to go down in flames.