You can't possibly compare the Rite of Tranquility in Kirkwall and its use against Erimond one and the same because it isn't. The Rite was being heavily abused in Kirkwall. Mages were randomly plucked, and were made tranquil without provocation. Erimond on the other hand did it to himself. He committed war crimes against the Grey Wardens, and aided Corypheus
I most certainly can. As I've said before, it's not about Erimond; it's about the Rite of Tranquility. He doesn't matter so far as its use is concerned. My stance is that it will be used strictly for innocent mages in dire circumstances, where their magic is too much for them to bear. My Inquisitor is not a Templar, and doesn't answer to the Chantry, does not abide by their chant or any of their laws and never will. In my Inquisitor's viewpoint, he receives equal treatment for his crime, regardless of the inherent inequality of being a mage, so no special forms of punishment. Basically, the use of the Rite as punishment against the guilty is something my Inquisitor would totally abolish, without exception.
The choice of making him tranquil was an act of mercy, and not much of a punishment. If you sent him to the Grey wardens to be punished he would most definitely be killed. It was up to you to know what lays ahead of him. Erimond already proved to you that he is not a responsible mage. Instead of using his magic talent to serve man he allowed his magic to rule over him.
Again, not about him, so as an "act of mercy", it's pretty irrelevant. Besides, I'm not interested in showing any kind of mercy to his ilk, so the options are whatever horrible fate the Wardens have, or the quick and easy removal of his head and having his miserable corpse tossed down the mountainside like yesterday's garbage.
Chantry or not if you have the technology to spare someones life from a capitol punishment, why not use it? The Rite of tranquility does have benefits. It isn't as bad as what Dragon Age 2 or what Asunder showed us.
The once dangerous mage prisoner now tranquil can become a skilled craftsman of magical items.
Why viciously execute them when the technology is right there to force them to become a productive citizen of the community?
That is my interpretation of the Rite of Tranquility. Forget Kirkwall and Asunder... Look at the benefits.
Why would I want to spare him from capital punishment?
Frankly, my Inquisitor has no use for another emotionless librarian or something. She already has Alexius, a number of tranquil from the former circles as well as the former rebel mages in her employ on top of her mage companions that can also study and aid in magical affairs, so the bases are well covered. I see absolutely no meaningful benefit, but far more drawbacks in what he would represent, which is that tranquil mages are automatons made to be used by institutions as they see fit. My Inquisitor will not be part of that.