SB 1.9 - Kṛṣṇa's love for Arjuna
Arjuna ordered Kṛṣṇa to place his chariot between the armies of soldiers and Kṛṣṇa obeyed this command. While there, He shortened the life span of the enemy soldiers, by taking away their prārabdha-karmas simply by looking at them. Bhīṣma’s mind pictured this scenario. The Lord is never the order carrier of anyone but He willingly carries out the order of His devotees. Diminishing the duration of the lives of the enemy does not mean that the Lord was not merciful. Those who saw the Lord at the time of death attained salvation, and thus all fighters attained salvation at Kurukṣetra. Therefore, the Lord is all-good, and whatever He does is for everyone’s good.
When Arjuna was seemingly polluted by ignorance upon observing the armies before him, the Lord eradicated his ignorance by delivering transcendental knowledge. The kings and commanders fought in the battlefield and were not like the modern day presidents. The fighting happened at a place far away from the civilian residence, so that the innocent citizens were immune from all effects of the fighting. Arjuna, seeing his friends and relatives like Droṇa, Bhīṣma and others, was overwhelmed with compassion and decided not to fight. Thus it is said here that his intelligence was polluted, but being a devotee, constant companion and the avatāra (Nara) of the Lord, his intelligence could never be polluted. Apparently this happened so that the Lord could deliver the teachings of Bhagavad-gītā for the good of all polluted conditioned souls.