Plus the bomb was built with the literal opposite purpose of the JWST: blowing up!
Worst case scenario it doesn't blow up exactly right and you just build another one?
Worst case scenario it doesn't blow up exactly right and you just build another one?
https://www.insidescience.org/manhattan-project-legacy/atmos...
Since it likely would have just blown up (fizzle) even if it didn’t fully detonate that is a pretty remote possibility.
Second worst would be it went off on a base somewhere and nuked a US base. Considering the location of these bases and the nature of the war at that point, it would have been a footnote causality wise, but embarrassing.