It does make sense, but i still have questions. Are these rules written or is it just kind of a gentlemen's agreement? Like in golf, don't walk in the other guy's sight line while he's sizing up a putt? Or in baseball, if the catcher or the umpire takes a foul ball in the gonads, the other players make excuses to waste time, like talking to the pitcher or dusting off home plate or checking their facebook page ;-), until the injured player recovers and is able to breathe again.
The commentators I was listening to kept using terms like so-and-so "attacked" while a biker was getting a tire replaced, and they made it sound like this attack was in very poor form for the Tour. But they weren't just using that term, attacked, in reference to the tacks incident. Apparently, there were other times when one bicyclist would attack when he shouldn't have done that.
This is like trying to figure out the secret In-N-Out Burger menu. "I'll take mine animal style, please. Don't know what that is, but read it on a message board, wot?"