|Chapter 1: Observing the Armies on the Battlefield of Kurukshetra|
yady apy ete na pasyanti
mitra-drohe ca patakam
katham na jneyam asmabhih
papad asman nivartitum
O Janardana, although these men, their hearts overtaken by greed, see no fault in killing one's family or quarreling with friends, why should we, who can see the crime in destroying a family, engage in these acts of sin?
In the six verses Arjuna gives the third reason for not fighting: destruction of family.
As per the ksatriya code of conduct one cannot refuse a challenge to fight (or gamble). Since the Kauravas had assembled with the desire to fight, as a ksatriya Arjuna was bound to also fight. Srila Prabhupada comments that here Arjuna is once again speaking from a higher moral standard which states that no obligation is binding if the effect is not good. Arjuna thus states that though his opponents are blinded by greed to the devastating effects of the war, there is no reason why they should fall down to this level also. Just because his opponents are evil they should not become evil also.
Please read the Sanskrit Verse and the Prabhupada's Purport.