Cullen can say "Meredith was encouraging extreme views", but we never see what those were. More to the point, the mages WERE actually conspiring. Chapter Three in DA2 has that as it's main focal point. And the mages don't have the excuse of the red lyrium idol: Meredith was insane, but that was the point: She was literally insane. The mages like Grace no such excuse, they just wanted to murder. I see no evidence that Meredith personally wielded the brand until she went nuts, as it was Alrik all the Tranquil talked about.
When it comes down to it, I look at the actions of the groups. The mages willingly joined the Venatori, whereas the templars were either tricked or forced. Loyalists were slaughtered by the mages when they didn't want to rebel, we see no evidence of that with the templars. Meredith and Orsino were both equally bad examples, but Meredith, at the very least, was doing her job: She is supposed to rout out blood magic. Orsino broke every rule and had no excuse.
The templars could have been better, yes. But so could the mages. And the mages fell far worse. Look at the change of how the final section plays out in DA2. The templars rescue innocent mages who surrender, and only the crazy Meredith wants to kill them (and even then, she relents to question them first). By contrast, the mages do nothing but get slaughter by Orsino and summon a bunch of demons.
True, all we have is Cullen's word, but he's proven trustworthy. Cassandra also tells you that there were reports about abuses from Kirkwall, but the Seekers didn't seem too interested in investigating. Neither of them have ANY reason to lie to you. Plus, Cassandra is Pro-Templar, not Pro-Mage. Why would she fudge accounts on their behalf?
Okay, I have to say, mentioning Grace was a masterstroke. If there was EVERY a mage who was the poster child for 'EVIL BLOOD MAGE', she'd be it. Ungrateful, psychotic, ax-crazy abomination loving monster. She was evil. I CAN'T argue against that. I mean, she took the ONE chance that the mages had for reconciliation and BLEW it because she had an UTTERLY irrational grudge against Hawke. She and her VERY dead boyfriend had NO ONE to blame but themselves and they got what they deserved. Heck, they managed to drag down numerous mages AND Templars with them! Seriously, I thought mages were SUPPOSED to have an education...apparently she skipped Kirkwall Survival 101: Don't mess with Hawke and Company...like EVER!
Again, the mages DIDN'T start the war. That was Lambert. He was ITCHING for an excuse. The mages merely voted for independence...WITH the Divine's blessing. Lambert decided that he didn't want that, OR the knowledge about reversing Tranquility to get out and decided the mages HAD to die. First shot came from the Templars. The Seekers dissolved the Nevarran Accord. The Templars joined up. Red Lyrium came later. Most mages fled to Redcliffe and asked Ferelden for help. Some rogue mages AND Templars stayed out to get payback, but most of the mages ran and hid. Sure, Fiona was a complete idiot and trusted the Venatori. Still, remember that the Elder One was pulling ALL their strings. The Red Lyrium AND the Venatori were working for HIM.
Now, AFTER it blew up? Yes, there were mages who made it worse. That loon from Ostwick in the Tavern...the one who defended Tevinter like crazy and in the bad future became a blood mage? I DOUBT she was in the minority. Still, it was the leaders of the mages that made the agreement to join Tevinter. Most of the mages were bemoaning the fact. If Connor was there, he told you flat out that he was against it. Most of the mages do. They just wanted to be free...they DIDN'T want a war. Alexus used time magic to manipulate events and Fiona...dear, dear sweet Fiona in all her glorious make things ten times worse magnificent self panicked and agreed to terms she didn't understand. A deal that seemed to change faster than the one Lando took from Vader. Plus, at the end of it, she got to possibly watch as her own SON exiled her elfy butt in a bit of karmic turnabout. Good job Fiona, GOOD JOB...
Yet if you go to Therinfall, you'll see its about the same. The top guys took the Red Lyrium, tricked their subordinates and it worked out in the Elder Ones favor. Their stories are VERY similar. Yet Cole tells you that a LOT of Templars are pretty far gone. They stopped seeing their charges as human and instead as THINGS. Dehumanizing them allows them to commit horrific acts without the feelings of guilt that SHOULD accompany them. Some were good, but not most. Between the various mages we've had in our groups, the few Templars that joined up, Cole, and the books, it paints a pretty clear picture that something was fundamentally wrong with the Templars. Maybe it was the lyrium. MAYBE it was the conditions of the Circle. MAYBE, like with the mages...power corrupts. And when you have power over another human being, thats quite a bit of power.
Meredith was ill-suited to being a Templar based on her background. She clearly held a grudge from her youth. She may have hidden it, but she felt justified in what she was doing. Like many tyrants, she cloaked herself in virtue. She told herself and Hawke that she was doing it for the mages protection. To a degree, MAYBE...but the fact remains that once a mage has completed their Harrowing, they AREN'T supposed to be made Tranquil. SHE did it anyway. She defied the Chantry, HER boss, when she could. She may have gone off the deep end, but the seeds were already there.
NOW...as how this relates to Vivienne...she seemed to think that what happened in Kirkwall was the MAGES fault. Not the Templars. Cullen (who was THERE) tells you that both sides had problems. So does Varric. THEY were there. Vivienne creates a narrative that suits what she wants. She blames ALL mages for what Anders did. Remember, ANDERS blew up the Chantry. HE decided that reconciliation was not going to be an option anymore. He was an ex-Grey Warden apostate. NOT a Circle mage anymore. Meredith didn't care. HE KNEW THAT. He knew if he acted, she'd kill them all. He turned Kirkwall into bloodbath. Meredith was simply happy to go along with it...a bit TOO happy. One has to wonder what she would have told the Divine after slaughtering everyone. The Seekers would have had to put her down.
It was ALL a mess. Grey and Gray. MOST mages aren't child eating crazies, and most Templars don't kick puppies for fun. Painting them with such broad strokes doesn't help. Vivienne is HAPPY to throw her fellow mages under the bus. By paining HERSELF as the only true loyal mage, she cements her position and power. Never mind all the innocents caught in the crossfire. Templars are merely TOOLS to her. Their lives don't matter EITHER. She's a base breaker for those reasons. Not everyone will agree, and everyone is right to their opinion. Mine says she's basically a villain protagonist...but only just. At least Loghain, Meredith and the Architect had good intentions...she's only in it for herself.
IMO...