Or there's fear of the alternative.
If the world had to end, and you have a couple choices?
Imagine North Korea and Pakistan get into a barney, and it's 40 seconds till they let all their shit fly.
40 seconds till the end of the world.
40 seconds till there's radiation everywhere.
40 seconds till 4 decades of nuclear winter.
Radiation and nuclear winter suck.
This, a global black out, which deactivates missiles in their silos and missiles in the air simultaneously saving the planet from the crust being cracked a sunder and the atmosphere igniting.
It's the ultimate countermeasure to MAD.
Well the ultimate countermeasure is civility, but this is all they could swing.