But nukes haven't destroyed themselves because there is too much overkill.

The new weapons are precise enough to destroy just their own industry.  And of course the enemy's advanced weapons manufacture industry is always the #1 target.  Companies that bid for military contracts are volunteering to be targets.  They know how effective the technology is, that the enemy also has it, and that the tech will be used on them in the event of an all-out war.  I guess for the right premium people will do anything. 

 It is a very much more precise, advanced way of going about things but ultimately, it all comes down to M.A.D. If the smaller more precise munitions start to target the manufacturing bases, what options are left open? Then, the nukes get launched. Not pretty.