I've been anti-Mage since DA2. DA:I proved that it wasn't just Kirkwall. Mages need to be kept under heavy ****** watch. Not to say that what some Templars do to abuse their power isn't wrong, that needs to be monitored as well. But the mages have proven that the system of the chantry does more overall good for society than bad.
In a sense that is backwards-reasoning. The chantry is right because the mages that wanted to free themselves from the chantry killed people. Thats roughly the same as "Beating the Zoo-tiger is actually good because sometimes abused tigers attack their abusers."
The Circle-System basically creates those monsters due to the mages abjection of being randomly jailed for the rest of their lives. Then, when the mages lash out, trying to forcefully claim the freedom they wouldn't get any other way the chantry goes "See? Those people we abused are killing us now. they would have done the same without us abusing them. We told you we were right."
It's funny how easy it is for people to completely reject human rights the moment they can distance themselves from the problem. When the police storms your house and tells you you will serve a life sentence cause you're going to become a killer someday, you would probably like THEM to offer a shred of evidence as to why you'd kill someone and why they believe they can judge your future intentions, right? You wouldn't just go "Damn, I can't prove I'll never kill someone in the future. Better take me to jail. I deseve it."
Now that there's a similar problem (and yes, being a mage does not mean you're twisted enough to seek blood magic just like holding a butterknife doesn't mean you'll definitely stab someones eye with it) and many people that have been jailed for 10, 20, 30 and more years on such ridiculous claims break out of jail and oppose the police that robbed them of their freedom many people here go "Nah, they have no right to be angry, if they oppose the flawed system they just prove they were guilty all along."
The Circle is (amusingly implied in its name) kept alive by a circular line of reasoning.
"This dog might bite. I should kick it to teach it its place."
"Dang, the dog bit me cause I kicked it."
"I have now proven the dog bites, so I'm free to kick it some more."