If the U.S. power grid is taken off line for weeks or months, people will die. Many people.
For most of human history, to attack an enemy required placing yourself in danger as well.
Soldiers met soldiers on the battlefield. Archers were vulnerable to return volleys. Artillery to artillery. Air strikes to flak from ground forces, or to direct dog fights.
As the tech of war advanced, sooner or later one side’s new advantage would end up empowering the other side as well, all the way up to strategic missile nuclear threats and the development of missile defense systems in the latter part of the 20th century.
