The children of Indis were considered just as great by many of the mightiest lords in Middle-Earth. Their lineage was certainly less tainted by the Oath of Feanor, and I mean Fingolfin...c'mon the guy called out a God. Melkor only accepted after knowing he would suffer a massive loss of face if he didn't answer the High King.
This doesn't even speak to the fact that none of Melkor's servants (Sauron, and the Balrogs included) would even attempt to stop him as he rode to Angband thinking he was Orome himself because of his rage and glory.
That my friends, is the epitome of being badass.
Now news came to Hithlum that Dorthonion was lost and the sons of Finarfin overthrown, and that the sons of Fëanor were driven from their lands. Then Fingolfin beheld the utter ruin of the Noldor, and the defeat beyond redress of all their houses; and filled with wrath and despair he mounted upon Rochallor his great horse and rode forth alone, and none might restrain him.
He passed over Dor-nu-Fauglith like a wind amid the dust, and all that beheld his onset fled in amaze, thinking that Oromë himself was come: for a great madness of rage was upon him, so that his eyes shone like the eyes of the Valar.
Thus he came alone to Angband's gates, and he sounded his horn, and smote once more upon the brazen doors, and challenged Morgoth to come forth to single combat.
And Morgoth came.
That's probably up there as one of my favorite passages in the whole Legendarium, it's just such an epic moment! You know that it's on once Melkor comes out of Angband, and I always liked to picture that Melkor actually was the size of a tower, and that Fingolfin was fighting back against the legit ultimate evil in Ea against all odds. Such great imagery.