A nuclear explosion in space will only release prisoners in the Phantom Zone.
You can argue about the impact, but there is no doubt that China has or got the technology to build both a neutron bomb and an EMT device. Many pieces of equipment..civilian and military are tested to EMT specs, but no one really knows what the impact might be.
This is one reason a “star wars defense is needed”..even a small nuclear power might figure out how to do this..like N. Korea.
I can picture Obama kneeling before Zod.