Just ignore the fact that Keepers and Seers and Shamans rule and that is one of the veryconsequences of mage freedom that the
Circles safeguard against, regardless of whether this rule is achieved through force or cultural domination.
You'd think Dean would havê said this enough but just because the culture of the Dales or Traditional Rivain persist, it doesn't mean their mages are not causing devastation. It just means it is not enough to wipe them out.
Adding to this: the Dalish portion of the Main Plot of the first game revolves around a werewolf curse set up by an angry mage, which chased the human populations away from the Dalish and eventually came home to harm the Dalish as well. Notwithstanding that his anger was understandable given what happened to cause it, Zathrian acted on it in a truly irresponsible manner and while his leadership was apparently good in other directions the curse really could have destroyed his clan. Heck, it can destroy his clan if the Warden decides to allow it.
Then there's DA2, where Merril seeks to repair a powerful magical artifact using a demon's advice. Now, she seems to have the brains not to use the demon's magic, and she's aware that using demons is really, really dangerous and asks Hawke to be nearby to kill her if she goes abomination. This is still ridiculously stupid of her, and could lead to her clan's destruction if the demon kills Hawke or slips by. But we know that this probably wouldn't have happened, because a more experienced and more powerful mage deliberately let the demon out to possess her instead and Hawke killed the more powerful abomination.
And then there's Velanna, whose sister was captured by the darkspawn. Said darkspawn sought to deflect attention onto the humans. Velanna falls into a deception Oghren smells something wrong with at a glance and the WC works out the details of with almost no difficulty and allows herself to be baited into killing a whole lot of defenseless humans in order to recover her sister from them.
This can't possibly be typical of the Keepers and the Firsts, because if it was their clans would have long ago died out, but the fact that it can happen proves that whatever the Keepers do to train their Firsts isn't exactly a foolproof guarantee of wisdom and restraint. Now, the problem of deliberate abuse of magic isn't enough on its own that I'd suggest using the Circles, but it's evidence against the idea that the Dalish have a better system, isn't it?