Agreed.The myth of combat effectiveness of poison gasses vastly outstrips their actual bettlefield performance. Poison gasses, nerve agents, etc are unpredictable, easily dispersed, and just not a great weapon of war, especially if your enemy has preventative measures.
So, let's say you have that 1T warhead. On paper, one ton of sarin can kill a hell of a lot of people.
But you need to disperse that sarin (more likely tabun) over an area, or you are just hypersaturating a living block. Then you have to factor in wind dispersal, occlusion in buildings, etc,etc, and in the end, you have not killed significantly more people than just a cheaper and more reliable warhead.
Factor in as well that rockets explode. A big fireball from everything flammable in a rocket (and in the target), and your nerve agent probably burns into much less harmfull compounds.
Effective dispersal means spreading many little bomblets across a wide area. The tactics would be similar to city bombing... You need to overwhelm the fire fighters and civilian protection at the target location, and you need to combine the chemical attack with explosives, both to tie up fire fighters and to force people out of homes into underground bunkers.
So there's no use for rockets, really, you want to use bombers. And at this point there are only so many bombers, so the question is, do you load more chemicals and less explosives, or more explosives and less chemicals.
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