Sridhara Swami's Commentary
Morever even if we could choose the path of unrighteousness in this matter, we cannot determine which is better for us, victory or defeat. These two alternatives are pointed out, whether the Pandavas should conquer the Kauravas or be conquered by them. But even in conquering them the victory would still be virtually a defeat because it is stated here by Arjuna that: slaying those very persons whom after there would be no desire to live. So win or lose was defeat in his eyes.