What objection arises if the maxim is treated as saying all killing prevents killing?

Musāwāt and Ījāz al-Qaṣr: Proportionate Wording and the Rhetoric of Qiṣāṣ

• All killings are lawful qiṣāṣ
• Unlawful killing can cause further violence and retaliation
• The Arabic word “qatl” has no recognized meaning
• The word qiṣāṣ cannot have tanwīn