[jgys]

Just because an anecdote involving Lance Armstrong was illustrative of this tactical cooperation doesn’t mean that it’s only for Lance and other loathsome cheats and bullies.

As the previous commenter pointed out, it’s common practice to work with a few of one’s opponents in order to beat all the others. Road cyclists’ greatest adversary is aerodynamic drag, which cannot be fought alone as long or as hard as it can be fought in a group of riders cooperating with each other. If you’re in a small breakaway with a few opponents, you and your opponents can choose to cooperate with each other or you can choose to not cooperate and end up falling back into the peloton, within which each rider has much less work to do and consequently tires much less quickly.