That just means they aren't evil for the sake of evil. Instead, they're viciously destructive and dangerous or capricious and cruel in ways that make a great deal of internal sense to them. I'm sure somewhere there are Second Circle demons who wouldn't be terrible news to unleash on Creation, but all the most famous ones, um, aren't.Reminder: Exalted demons are not Christian demons, and may well be perfectly reasonable people to negotiate with when summoned. 'Rampage' may well never be on the cards, because the demon is more interested in cultivating good relations with somebody who can provide them with time in Not Hell.
Octavian: Powerful demonic warlord.
Mara: Masterful seductress and manipulator who thrives on cruelty and corruption.
Florivet: Violent asshole who scars women with acid when he gets offended.
Alvuea: Turns people into weapons.
Zsofika: Ritually hunts and eats people.
I know of a few whose names I can't recall who were less offensive. One mostly just likes books, another dude lives to make bargains and IIRC holds his end up and is pretty genuine about it. But just because they aren't standard conceptions of wicked monsters who want the entire world dead, doesn't make them mostly reasonable sorts. They're alien monsters who are kept outside of the world for a very good reason. You can deal with them, but it's not often a good idea, and unleashing them is almost guaranteed to have serious adverse consequences for basically anyone who crosses their paths.
They are, in the end, still demons.