I feel the urge to quote Herm Edwards. Teams can only depend upon the hand they are dealt. Or the hand they crafted for themselves.
The expectation of any team is to win a game despite whatever weakness they actually have. Otherwise, they should simply forfeit and not play the game. Additionally, the odds may weigh heavily against any team having 'no running game'. However, there are times an offense having no running game outscores their opponent anyway.
In the end, an argument can be made to support why an offense could not win a game without its defense. However, criticism cannot be totally excused if it does not execute the phases of its game that it does do well despite what it does not do well.