Sera has a very very wrong view about elves.
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Given Sera has probably been told her entire life she's a "race-traitor" no wonder she thinks they're both scum.
If you assume the latter, it's hard to claim the former.
Well, unless you actually think it's possible to be a race-traitor and that people should believe certain things and hold certain positions based on their birth, in which case I'd differ about which very very wrong views about elves we should be concerned about here.
Which is that they're citizens of the world and no worse off than anyone else small.
*Citation needed.
She doesn't live in an Alienage so she doesn't understand how bad it is.
Arguable. She's certainly aware that she was not amongst the lowest of the low, in her companion dialogue with Cassandra.
I'd honestly have to question your expertise on this evaluation. You don't live in an Alienage, after all- can you claim to understand how bad it is? If you don't, could you claim to have a better understanding than Sera? Considering you're here on a luxury product forum using idle leisure time to discuss fake people, Sera probably has a better claim to being intimiately familiar with the merely banal povery and underclass existence than you.
Ironically, she provides the perspective of "Flat-Ears" like Iona.
You know, the ones BOTH City Elves and Dalish hate.
Huh?
Iona was a city elf, and I'm hard pressed to remember any city elf collective sentiment aimed at her. She certainly didn't hate herself. Calling her a Flat-Ear to categorize her as somehow distinct from City Elves is a false distinction. Trying to categorize all city elves under any attitude (or even identity) is just silly- the elves, even the city elves, are not a unified identity-polity.
The Dalish bear contempt for pretty much everyone who isn't Dalish, including city elves, so their dislike is kind of a ?.