Hmm. Really one for the game theorists, this.
But assuming our tiny, little island is on the receiving end of even a limited, 'Square Leg' - esque exchange, it's safe to conclude we'd be pretty much 'clucked', son.
So, what do you retaliate against - empty / irrelevant silos & facilities? There may indeed be some utility in 'keeping your powder dry' for the post - exchange environment. Or, if truly you seek vengeance 'Gotterdammerung stylee', sod the cities - swathe the enemy's agricultural lands with groundbursts.
All perfectly logical, all perfectly insane.
Best,
Frank