Anyone else troubled?

I don't want to sound like a reactionary fool, but has anyone else that has seen this documentary come away feeling really unsettled? One thing I found striking is simply this: in a cyber war, as a nation the United States is only as strong as its cyber weapons. It doesn't matter how large our military is, how many stealth technologies we can utilize, how many bunker-busting precision bombs we could launch, or how many troops we can gather, because in a cyber war, "all bets are off". Any nation state that wants to launch an attack crippling our infrastructure could very well be capable of that. As a nation, the United States would have the most to lose in a cyber war because of our very reliance on technology. You can only imagine the difficulties if our power grid went down, along with the Internet, air traffic control shut down, water treatment plants taken offline, the banking system unable to process transactions, even gas pumps unable to dispense fuel - just a few things that could happen - concurrently. Would we see "martial law" in the streets as a bi-product as people try to survive? Sure, it's all hypothetical, but in this age of advanced technology, it is very much possible and in play for our enemies.