It is the same with Nuclear weapons. You can't control where the radiation is going to go. But again enforcement of the ban is only possible due to Nuclear weapons. A case in point is almost every first world country has stock piles of the stuff in case of a rainy day.
No, it’s not. Many weapons are messy. Many weapons are de-stabilising. Few are both. HEU is difficult to enrich, difficult to transport undetected and difficult to arrange into a working bomb.
