That's sort of right. While most demons do enjoy destruction, chaos, and causing humans fear and anger so they can consume their souls, there's actually demons out there who make it their mission to protect humans, who don't even want or need to consume souls or cause destruction.

[He'll keep brushing, but his eyes look elsewhere for the moment.]

They're pretty rare, though. They're called Genma, and before they became demons, they were gods or heros that specifically protected humans from evil demons.