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Good point. It is possible that weapons research has positive externalities and a deterrence factor. The lack of any armed forces on this list is somewhat surprising - although definitely not all armed forces roles would belong.

Agriculture and the systems built around it in much of the world has serious problems for the world and it's future.

They were considered, see:

"Military decision-makers"

and

"Working in the army"

They didn't make the top ten in part for the reason you gave.

They aren't in order from worst to least worst. I've added a footnote to clarify this.

The list isn't in order.