The wisest men follow their own direction. - Euripides

It's human; we all put self interest first.

ŒD. O Fate, from the beginning how wretched [and unhappy] didst thou form me, [if ever other man was formed!] whom, even before I came into the light from my mother's womb, when yet unborn Apollo foretold that I should be the murderer of my father Laïus, alas! wretch that I am! And when I was born, again my father who gave me life, seeks to take my life, considering that I was born his enemy: for it was fated that he should die by my hands, and he sends me, poor wretch, as I craved the breast, a prey for the wild beasts: where I was preserved — for would that Cithæron, it ought, had sunk to the bottomless chasms of Tartarus, for that it did not destroy me; but the God fixed it my lot to serve under Polybus my master: but I unhappy man, having slain my own father, ascended the bed of my wretched mother, and begat children, my brothers, whom I destroyed, having received down the curse from Laïus, and given it to my sons. For I was not by nature so utterly devoid of understanding, as to have devised such things against my eyes, and against the life of my children, without the interference of some of the Gods. Well! — what then shall I ill-fated do? who will accompany me the guide of my dark steps? She that lies here dead! living, well know I, she would. But my noble pair of sons? I have no sons. — But still in my vigor can I myself procure my sustenance? Whence? — Why, O Creon, dost thou thus utterly kill me? for kill me thou wilt, if thou shalt cast me out of the land. Yet will I not appear base, stretching my hands around thy knees, for I can not belie my former nobleness, not even though my plight is miserable.

But I wish to give you a wise piece of advice. When a friend is enraged with a man his friend, having met him face to face, let him fix his eyes on his friend's eyes, this only ought he to consider, the end for which he is come, but to have no recollection of former grievances.