Let's see if I can figure out how to work these quotes.
Because the Dragon Age media (games, books, comics) portray "apostates" in a way much different than the Chantry's rhetoric. The Chantry (and many of the 'pro-Templar' posters in this thread) would have you believe that a mage living free of the Circle is bound to become possessed and the resulting abomination will lay waste to the countryside. We haven't seen it.
Sure, we've heard about adolescent mages awakening to their power and harming themselves and others, but it should be noted that those stories took place within populations that fall under the Circle system, not among apostate groups.
Do you mean that we haven't seen apostates turning into abominations in large numbers (so to say since mages are rare and apostates in Andrastean nations even more so, I believe) or do you mean that we haven't seen them ravaging the countryside?
I recall off the top of my head at least one abomination in Origins that was an apostate being taught by apostates that we end up having to hunt and kill when their former master fails to do so.
There are places on Thedas without the Chantry, and in at least some of those places there is no paranoia regarding mages. Everyone acknowledges that mages have powerful abilities, but they don't have the irrational fear that the Chantry's dogma creates in Andraste's flock. Rivain is a good example--the seers live in and with Rivaini society as they have for thousands of years, and that society wants to keep that arrangement intact and is resisting the Chantry's efforts to "save" them from the threat of their mages.
I'm not sure if Rivain is that good of an example, really, for them abominations are just a fact of life.
In Rivain abominations are treated nearly like natural disasters. They happen, they end, the survivors mourn their dead, the survivors go on with their lives.
This is something that the Circles exist (at least in theory) to stop abominations from becoming an occurrence that people simple handle as a natural part of life, amongst other reasons ofc.
The Circle system works to reduce the number of abominations that cause the death of non-mage civilians while Rivain does, well, nothing, they just let things happen and deal with it afterwards.
What's interesting is comparing the Circle mages and their Templars with the Saarebas and their Arvaraads. Both the Chantry system and the Qunari policy apply the same fix to the same issue, but the Circle tries to veil it in civility while the Qunari are ruthlessly efficient. In both instances the mage is stripped entirely of liberty and allowed only to act at the handler's discretion. Both are "dehumanized" (an odd phrase to use when applied to non-humans, I concede) and treated as an object--a dangerous thing. I find it incredibly audacious for supporters of the Circle to criticize the Qunari policy as barbaric.
The Circle is closer to a quarantine, really, IMO. The mages are given basic rights and receive special care, with precautions taken to protect "uninfected" people from exposure to the "disease". They certainly have much more freedom and conforts than in Qunari lands.