Lance Armstrong, he of illegal performance-enchancing drug confessions, has been called a lot of things recently, among them a "master manipulator" and a "liar." But it's not like he's the first to fake his way to the top, nor the man who made the most doing it.
Of course, there's no one reason to cheat. Some people simply enjoy the thrill of cheating itself, which probably explains why Americans are so willing to cheat, and so unwilling to consider that they'll get caught. I mean, check out these guys: