QA : Verse no. 1.36

Question 1 : Why Arjuna did not want to take any action against his own kinsmen ? Why he is addressing Lord Krishna as "Mādhava" ?

Answer 1 : "Although a responsible man in the administration of a state is required to be saintly, he should not be cowardly. For example, Lord Rāma was so saintly that people were anxious to live in His kingdom, (Rāma-rājya), but Lord Rāma never showed any cowardice. Rāva?a was an aggressor against Rāma because he kidnapped Rāma's wife, Sītā, but Lord Rāma gave him sufficient lessons, unparalleled in the history of the world. In Arjuna's case, however, one should consider the special type of aggressors, namely his own grandfather, own teacher, friends, sons, grandsons, etc. Because of them, Arjuna thought that he should not take the severe steps necessary against ordinary aggressors. Besides that, saintly persons are advised to forgive. Such injunctions for saintly persons are more important than any political emergency. Arjuna considered that rather than kill his own kinsmen for political reasons, it would be better to forgive them on grounds of religion and saintly behavior. He did not, therefore, consider such killing profitable simply for the matter of temporary bodily happiness. After all, kingdoms and pleasures derived therefrom are not permanent, so why should he risk his life and eternal salvation by killing his own kinsmen? Arjuna's addressing of K???a as "Mādhava," or the husband of the goddess of fortune, is also significant in this connection. He wanted to point out to K???a that, as husband of the goddess of fortune, He should not have to induce Arjuna to take up a matter which would ultimately bring about misfortune. K???a, however, never brings misfortune to anyone, to say nothing of His devotees."

Ref : Bhagavad-Gita 1.36, Purport, Srila Prabhupada