Is there an example of a benevolent spirit using mind control?
I see where this line of questioning is going, but... whatever, I'll bite.
No, there is not. That we know of. YET.
To be fair though, we have encountered malevolent demons who didn't use it either - the Sloth-bear we meet during our Harrowing in the Mage Origins for example, though I think he does tell us he would if he felt like it or something along those lines. And how many benevolent spirits have we actually encountered in the games (not counting wisps and such that are probably not intelligent or powerful enough to do such a thing even if they want to)? Three?
Let's see, there's 'Valor,' who we also meet during our Harrowing as young mages, but it's hard to guage much about him from one conversation, There's 'Faith' (going off what is assumed), who possesses Wynne - and it's powerful, sure, but since even Wynne doesn't know (according to what she's willing to tell us - her portrayal in Asunder leads me to believe she was a lot more cunning than she ever let on to our Warden) anything about it's personality we don't know how intelligent it actually is or what it's capable of. And there's 'Justice,' who I'll go ahead and add to the benevolent category since he doesn't become more... nuanced, I'll say (I don't see him as purely malevolent even after he possesses Anders), until after The Merger. He doesn't use mind control, but even as 'Vengeance' he probably sees that sort of thing as beneath him.
My point being, spirits are an even larger mystery than demons are, and we only have three we've met so far. Unless there's mention of others in the canon books/comics - I've only read Asunder and a handful of chapters of The Masked Empire. We don't know what they're capable of at all, and all we know is that the only real dividing line between them and demons is that they have little interest in the material world.
Edit: What I'm trying to say is, I don't think Cole using mind control is any sort of proof that he's inherently evil. Demonic in nature? Possibly. But blood mages can use those types of spells too, and they are not demons, nor are they all (most are, but not all) malevolent. And Somniari can control minds as well, and they don't fit into either category. I think Cole is just a whole other animal.