I do believe that examples of stupid answers from the Tower like this serve the same purpose that David's killing the husband did: to protect the organization from suffering from its corruption.
I think you may be reading a little to much into this. There really can be no satisfactory answer to this QFR while maintaining a belief in an infallible bible.
All similar accounts( morally unjustifiable) in the old testament represent a difficulty for fundy's to explain. Any apologetic arguments they make, only show a lack of coherence with a claimed superior moral code that they like to believe the bible teaches.