I’ve studied the EMP issue in great detail, and I think the bottom line is that the effect is real, the magnitude is overstated, and to produce Forstchen/Gingrich-novel level damage would require hundreds of weapons with synchronized delivery, impossible for a goat-molesting state.
Don’t get me wrong - I think repeating “Death to America” plus having a uranium enrichment program is more than enough cause to declare war on Iran, and to use nukes ourselves to destroy their program if necessary.
I just don’t think whatever damage they could do can “threaten our survival”.