1) Militarily it only makes sense for those systems to be attacked as a preparation for first strike.
2) Because of that, the attacked side is supposed to consider this a launch-on-warning trigger
3) The side that attacks knows this, thus such an act is incredibly risky, and would only be done as a true preparation for a first strike.
Which reinforces the whole loop.
Where this breaks down is if the leadership of the attacked side is compromised and is not actually ready to strike back. Then you can use such attacks as a political tool to force submission.