All spirits besides God and angels are bad? You’re sure? From the Ars Goetia:
The 55th spirit is called Orobas, he is a mighty great prince, appearing at first like a horse, But afterwards at ye command of ye Exorcist he putteth on ye Image of a man, his office is to discover, all Things past, present & to come and to give dignities & places & ye favour of friends & foes, he giveth true answares of divinity & of ye Creation of ye world, he is faithfull to ye Exorcist & will not suffer him to be Tempted by any spirit he governeth 20 Legions of spirits, his seal is this, wch must be made & worne as a Lamin &c.
(Emphasis mine.)
Even if he isn’t El’s greatest fan, that he interdicts temptation must count for something. Unless you think “morality” is just another word for “piety”, anyway.