Well hindsight is always 20/20. Few people look into securing their houses what haven't been robbed or known someone who was. Nobody benefits from this sort of attack; like you say, its a motive issue. Why does the production network need so much proection? Up until now it hasn't. There was nothing of any value there for anyone....only of theoretical value.
The only people who carry out this sort of attack are the ones who work for armies because they don't have to worry about personal reprisal and they are not interested in any sort of profit. Its just a game to them; and they will work to whatever goal they are told to.
Its the rise of this "cyberwar" bs that creates the danger in the first place. The only result is going to be to hurt some insurance company that is going to pay, or the steel factory, but more will be built. However, within the context of a cyber war group this is a demonstration of effecitveness or even a win for some petty head of state.
This is one more area where I was happier with the old threat of money hungry gangs and the occasional rambunctious kid than the massive politically directed machine that is supposed to protect me from them but ends up just being bigger, badder, and more capricious versions of the same.