Both Sides are Right:

Rav Henoch of Alexander zy'a (Sefer Chashbah L'Tova) discerns from this verse that there will never again be a fight like the one between Korach and Moshe Rabenu. He asks how this can be said when we can attest that there have been many very bad fights.

He answers that the Torah is saying that there never again will be a fight like this in the sense that one side was 100% right and one side was 100% wrong, as in all future fights, both sides will bear partial guilt.