Here's what I don't understand about Cavendish leaving the Tour for the Olympics:
1) Wouldn't he have known before the Tour started that there would be a scheduling conflict? Why start the Tour if you know you won't be able to finish?
2) Every rider in the Tour is obviously a world-class athlete. So why weren't there more riders in the Tour also participating in the Olympics?
3) The Olympics and the Tour are both world-wide events. Why would there even be a scheduling conflict in the first place?