Ah, Vivienne.
To me, she represent those who are relatively lucky and blessed in life, and therefore are against anything that might jeopardize their comfy lifestyle - which is quite understandable, if not a very sympathetic position to be in.
But is she wrong? Well, not comletely.
On one side, it seems that the mage rebelion is too disorganized, self-destructive, and causes too much collateral damage to be anything but doomed, at least unless something drastic is going to happen. (like support from the "Herald of Andraste" for example)
But on the other side (her smug self assurance aside) her version of the events is just the narrative from a certain point of view.
She ignores the fact that the unrest didn't start with a single event, but was something the developed over who knows how long.
She ignores the fact that while Anders and his like are very conveniently in a position for those who want the blame Mages as a whole or at least the rebel-Mages, they have numerous counterparts in the chantry that are no less ruthless bloodthirthty or insane.
She also ignores the fact that in some cases, like in Kirkwall, the rebelion started only as a reaction to a collective death-sentence that hovered above every remaining mage there, (at least those who managed to evade the so called "Tranquil Solution") and as an absolute last resort.
So yeah, no matter what you say, there are two sides to this coin, and no amount of wit on Vivienne's part will hide the fact that she represents only one of them.