That's all true of bombs detonated high up in the air where the only elements around are hydrogen, oxygen, nitrogen, carbon, and argon - none of which tend to be neutron activated in a particularly dangerous way. On the ground if you're using bombs for engineering work there are a lot of other elements that do get very upset if you hit them with fusion neutrons.
Even in the context of 3 stage designs there's a huge difference in fallout between airbursts and groundbursts. It's the groundburst fallout that would have killed everyone in Copehagen and Stockholm if WWIII had gone down when the wind was blowing from the east, even with a successful US first strike.
Even in the context of 3 stage designs there's a huge difference in fallout between airbursts and groundbursts. It's the groundburst fallout that would have killed everyone in Copehagen and Stockholm if WWIII had gone down when the wind was blowing from the east, even with a successful US first strike.