I have no idea why the Schlecks get so much hate. Technically, Contador is the one that needs to attack. I imagine Frank and Andy were mostly just testing Contador. Given Contador's crash, if they weren't certain Contador was not going to hang with the GC contenders it would've been silly to attack and have Contador ride your wheel and then launch his own attack to take him back. Frank had over 2 minutes on him and Andy 1:45. They can both sustain that in the time trial.
It's not like they haven't attacked in prior years. There have only been a couple big stages, so I'm willing to wait for 18 and 19 before writing off the Schlecks. If they killed themselves last Saturday while Frank was ahead of the GC contenders and Andy was 9 seconds back from Cadel, everyone would be calling them idiots.