What bad decisions? Jsut because comentators who think Lance and Johan are Gods think he made bad choices does not make it true.
For example, they commented that he was too far back in the group on the final climb. Yet when there was an attack he had the legs to cover. By coming from a little ways back he had the chance to catch the break and NOT drag his real competition up to that break. It did not work, but then not everything Lance the god did worked either. This may also have lured others into attacking, considering the support situation it was to Contidor's comparitive advantage to heve the race broken into pieces.
Then there was the last sprint point on the course. If Lance had managed to grab the single second it would have been brilliant, when Alberto does it, it is all but ignored.