I think the Villains are actually a bit more important.
1.Without them there wouldn't be such a thing as a "hero" without an antagonist there's not really an protagonist and vice versa but...
2.Without the Villain there's not really a way for the hero to grow and become a better person
3.Conflict creates interest in people without someone creating a conflict most of the time the plot can get a bit boring
4.Villains can create a sense of hate or resentment towards that character which helps create an even stronger bond, hope, ect fpr the hero which helps you become for attached and involved into the plot