It is not on Doc that the players are not executing the plays correctly, and therefore are not getting good shots.
However, what is on Doc is the attitude of the team going into the game, and the lack of focus by many of the players. Even though I personally believe there is litterally nothing he could do about it, and the NBA is completely a players league...that is still (unfairly perhaps) part of his job description.
So yes, Doc does deserve blame for not getting his players more focussed on the game, and not getting them to focus in general when their backs are not against the wall. But I am not sure there is a coach in the world that would have done any better.