Ted Koppel’s Lights Out I think is a good read on the topic.
EMP there could be some degree of evidence left behind to point a finger to.
Cyber-attack on the grid, that might be a bit harder to prove. And what is the retaliation?
@tolik, after reading that study about how little patience people have nowadays, having a major disruption like that might make people stop and see life around them vs in a phone screen.
The wife and I make it a point to sit and talk about things, face to face.