Again Hana, you are taking the worst example of a group and stating "That's how it always is and shall be." The actual code is in the lore, and the rest is your viewpoint based upon one example.
Yes, I am taking in-lore evidence as an example to form a viewpoint. That's what we're supposed to do.
I know you hate what Patrick Weekes did to the city elves in the book. I know you've been upset for about a year about city elves being an unplayable race. I know you're frustrated that they took a giantic backseat in DA:I after the build up in TME. Still, you're using one example from a book right before the Orlais civil war as an excuse to hate on this group.
I didn't hate what Patrick Weekes did in the book. I mean I did, but terrible things happening to people is par for the course for Dragon Age events so it's not like it was a betrayal or anything. And I'm not just using this one event to hate on this group. There's this event, events told to us in the games like that lady in Denerim whom her and her brother had to flee Orlais after her brother saved her from being raped by a Chevalier, events told to us in the books like all the things they did to the people of Ferelden, etc. There is a huge pile of reasons to hate the group and be perfectly justified to do so.
Look, every single BioWare game has had at least one exception to the rule, at least in the games I played. I can't speak for KotOR or Jade Empire, but in all of the BW games I've played, someone bucks whatever the trend is for their race/group. Every single time. Daelon Red Tiger was a smart and sensitive half-orc. Aerie was a winged elf (which were very rare.) Wrex was the krogan that wanted to lead his people and only followed paths of violence out of despair. Morrigan was our first apostate and goes completely counter to what most of the Chantry says about that group. Sigrun was a happy member of the Legion of the Dead. Legion from the ME series was a non-violent geth that spoke galactic. Iron Bull is more relatable than most qunari in the series so far in that he's been around the Chantry-based population of Thedas. He's also a spy that allows him some comfort as a Qunari, a first in the series. Solas is a freaking god in disguise (or close enough as far as we understand) and doesn't claim to be Dalish.
Can't say anything about Aerie or Daelon since those were characters in games before I joined Bioware's fandom, the first Bioware game I played being KOTOR. As for the others:
Wrex, while wanting to stop his people's path of self-destruction, is still a typical krogan in that he loved to fight and committed who knows how many crimes as a mercenary.
Morrigan fit the Chantry's definition. She was a woman who practiced blood magic, killed people, etc. You even got approval from her for pretty much every evil act you could do in that game.
Don't see where it says all Legion of the Dead members aren't happy, so don't get the Sigrun example.
Legion is actually a representative of what Geth are, so is the walking example rule for his race.
The Iron Bull is a typical Ben-Hassrath and Qunari. And if you turn him away, he becomes the rule of Tal-Vashoth.
Solas is the Dread Wolf, Master of Deceit, and spends the entire game deceiving us about him.
I'm not asking you to like any of these characters, but they are all exceptions to established understanding regarding the rest of their race/group.
No, they are all walking examples of that rule. They may have a unique flavor, which isn't surprising because people are unique, but are still part of the rule rather than an exception.
So, again, why not have an exception to that rule? I literally see no reason why not except for the words of some corrupt knights in a country on the verge of civil war. As far as Gaspard goes, I've read the book a few times and to be honest, I could see why some would side with him over Celene. I have said those honorable chevalier names, and there's evidence right there that there. I could probably take just about any example you could give me of a group not corrupt and I could point out the ones that were dishonorable. Monstrous, in some cases. Rather than dwelling on what happened in one book, have an open mind please. You might enjoy it. 
Because there is nothing to suggest that that is the exception to the rule but rather the rule. Thus, in order to be one they have to do that. The onus is on people saying it is the exception to prove that it is the exception.
I never claimed any group was pure, so don't know what your suggestion would accomplish.