Celene was pretty elf-friendly. She was trying to bring them up to the status of humans in Orlais, but was trying to do so to slowly and (in Briala's reckoning) in such a way as to further her own goals in the end. Celene's idea of an elven intelligence agency and shock troopers using the Eluvians is ultimately what lead to Briala taking the Eluvians for herself. Well, that and learning...
Briala is doing what she's doing because she's realized the Dalish won't help, and the human noble she had thought was helping wasn't *really* helping, and thus the only people who can help the Elves in the cities are the Elves in the cities. And like the story of Fen'harel baiting two gods into murdering each other to get what he wanted, she intends to bait the two powers of Orlais into murdering each other (by supporting which ever side is winning at any given moment, specifically) until they are so weak and drawn out from the fight that whoever is left will be weaker than the elves, who might finally be able to do something about their position in Orlais, and by extension the rest of Thedas.
I think trying to decide who is 'right' or 'wrong' in Dragon Age is asinine. This isn't Dungeons and Dragons. There's no convenient alignment system. You can't be a Renegade or a Paragon like in Mass Effect. There are only people in Dragon Age, and some people might be doing good things for bad reasons, or bad things for good reasons. Lord Seeker Lambert (who I am 90% certain was murdered in his bed) truly believed that Mages left to fend for themselves would become Magisters, because in his experience all the Magisters he had befriended did everything they could to get an edge on the people above them. It was a tragedy that he couldn't see that he was doing exactly that himself, just with less blood magic involved. Jowan really believed that shattering his phylactery and running away were the right things to do, and that only dabbling in blood magic was an okay thing. Anders truly believed that blowing up the Kirkwall Chantry was the only way to save the mages by forcing the inevitable war to begin, rather than prolonging their plight. Zathrian really believed that placing a curse on the humans who assaulted his family was the only punishment fit for them after the way they brutalized his children and wife.
In short, there's only two things in Thedas that can be seen as plainly, unequivocably evil: Darkspawn and Demons.