That's more true for West Germany than East Germany during the Cold War era though, East German industry was more centralized or at least in the process of being centralized after WW2. It actually looks like most targets in East Germany were military infrastructure (which is interesting on its own, because I would rather have assumed that the goal was to inflict maximum human casualties, e.g. same as Hiroshima and Nagasaki).
If you want to stop the production of nuclear warheads, you cripple the factories that make high pressure, special alloy cooling pipes for example.