Writing a novel is not merely going on a shopping expedition across the border to an unreal land: it is hours and years spent in the factories the streets the cathedrals of the imagination.
The old cathedrals are good but the great blue dome that hangs over everything is better.
Film is the manipulative medium par excellence. When you think back on the history of film and the 20th century you see the propaganda that's been made. So there are moral demands on the director to treat the spectators as seriously as he or she takes himself and not to see them merely as victims that can be manipulated to whatever ends they have.