2012 Vuelta a España - Tour of Spain

^^
I think you're missing the point.

There is no issue (unless you're Valverde and sour) if a crash occurs whilst a move is in play. The attack had to happen at that section of road, and you can clearly see Sky on the front and pushing in replays of the crash.

Had they attacked after the crash then they would have questions to answer, and quite possibly riders would have objected (on the road and afterwards).

It was a pretty fine, line the attacks had literally just started as one of the Sky rider moved it took out a front wheel bringing Valverde and team mates down ... valverde's team manager said it was intentional by sky thats an accusation of the highest order !

You could see how the peleton got ripped apart by that side wind the view from the helicopter showed 3-4 eschelons down the road, it was an obvious place for the attack