لَمْ نُكْمِلِ الرَّصْدَ لِكَثَافَةِ السُّحُبِ، لَا لِقِلَّةِ الْعِنَايَةِ.
We did not complete the observations because of dense clouds, not through lack of care.
The first clause might invite an unfair attribution of negligence. The added lā li-qillati al-ʿināya expressly blocks that unintended reading. Its function is iḥtirās: safeguarding the meaning rather than merely adding another detail.
A genuine risk of misunderstanding must exist in context. Negating random, implausible implications would not constitute effective rhetorical amplification.