وَلَكُمْ فِي الْقِصَاصِ حَيَاةٌ
In lawful retribution there is life for you. (Al-Baqarah 2:179)
A very short clause points to a broad social rationale: deterrence may restrain killing, preservation of life becomes possible, and collective security is served.
Rhetorical point: these connected implications need not be spelled out in a series of sentences. The expressed words are concise but rich, which makes this ijaz al-qasr rather than a conventional case of omitted words.