So you admit that the US electronic infrastructure is vulnerable, yet fail to recognize the utterly horrendous consequences of an attack upon our electronic grid? How many of us would survive when the lights, power, water, were instantly cut off, our cars wouldn’t start, and our local grocery store was shut down?
First, I do not believe NK has the capability of a large scale EMP attack.
Secondly, I believe your listed scenario of the effects of a large scale EMP attack is greatly over exaggerated. Will, there be problems, yes. But I do not see the doomsday level of problems as you indicate.
Thus, the grid needs to be updated to avoid potential problems, even though I do not see the doomsday level as some would like to promote.
Also, don’t forget humans have a great ability to adapt and survive should your doomsday scenario come to pass.
Hope that helps.