I just played the mage origin again earlier this evening (then switched to Kingdoms of Amalur but that's besides the point) and there's one thing that must be pointed out.
Before MisterJB gets involved in this discussion and talks about all the luxeries and comforts a Circle mage enjoys that peasants do not, I'd like to point out something that caught my attention. There are two mages being trained by their mentors in the library on your way to see Irving. Both of them are essentially given the same advice. Control and master your emotions. Fear weakens your will, and that makes you easy prey for a demon. The first mage starts panicking when he hears about the injuries that can occur while trying to control fire. His mentor tells him to calm down because the flame reacts to his emotions, and he sets himself on fire. The second one is using a Fade Shield and is told that his fear is making his shield weaker, his will is wavering, and asks him if he wants to be possessed by a demon, encourages him to stand firm and know that he can do it.
Now, this is all well and good, and is the positive motivation mages do need, but it also shows another point as well. Mages need to be emotionally healthy and strong to control their powers. If they are forced into situations where they live in constant fear and paranoia, are kept down emotionally, traumatized or anything of the sort, it can have adverse affects upon them and their control.
Unless mages are given a strong emotional foundation, can build self-esteem, and become confident in themselves, they are in greater risk of possession and of losing control of their power.
It doesn't matter if things are great in the Circle, material-wise, if they are torn from their families that don't want them, have their children taken from them as Chantry property moments after their birth, are not allowed to marry, and so on and so forth, it becomes that much harder to build a strong emotional foundation.
It ultimately becomes a self-fulfilling prophecy and a downwards spiral. The templars say mages must be watched so they don't lose control, and they slowly gain more power to watch mages more effectively, and mages lose more rights over time thanks to the bad apples that ruin things for them as a group. The mages, or at least some of them, grow disdainful of losing those rights and act out, and if enough of them do it, the templars crack down on all of them, tighten their grip and use the mages who acted up as examples on why they're needed. Rinse and repeat.
Varic pretty much said this is what happened in Kirkwall after Act 2 when Meredith took control. She gained a great deal of power as the defacto Viscount, and squeezed harder. The harder she squeezed, the more the mages resisted, and the more they resisted, the harder she squeezed.
According to the Nevarran Accord, the mages in the Circle were originally supposed to govern themselves with a council of enchanters, be free to study magic of their choice, and in return they would live within these Circles and away from mundanes and allow the templars to stand guard in the event of an abomination, and watch out for troublemakers. But by the time Origins comes around, not even Ferelden follows that model. Gregoire, while a cool guy and a good templar, has a lot more power than the original Nevarran Accord granted to the templars. And Irviing admits that a lot of what he does is about survival. His exact line is "If you want to survive, you must learn the rules and know that sometimes sacrifices are necessary."
700 years of this downward spiral, hastened by the fact that three Annulments are called for within the same decade and two of them appear to be unjustified (Kirkwall and Rivain) has culminated in a powder keg of tension. It was bound to burst, as it did in Asunder.