Lance Armstrong didn't just cheat, he set up a whole doping ring.[1] The full report is at [2]. Section VI of the Reasoned Decision lays out his efforts to keep a lid on the whole thing.
There are plenty of athletes who get caught up in doping due to the pressures, but Armstrong is not a good example of that.
[1]: https://en.wikipedia.org/wiki/Lance_Armstrong_doping_case#US...