I didn't agree with that, either. I thought it the height of arrogance that she didn't even bother to show up for Korean Nationals!
You need to get your fact straight. Each country has a different rule and situation. Some nations, especially countries with a small federation that barely or never produce a top level skater don't consider domestic competitions as big as those of countries with a big federation like Russia or USA.
AFAIK, S.Korea has a rule regarding a bye for Worlds if a skater earn a medal at Jr. and Senior Worlds in the previous season, participating in a national is exempt. The rule was not made for her, and she was the first one and only one ever eligible for the written rule in the figure skating history of the country. I suspect the rule is even borrowed from a much popular sport in the country such as short track that has produced numerous Oly and Worlds medalists. KSU leans too much toward the sport and independent figure figure skating federation doesn't exist so far.
Before she emerged, almost none couldn't advance even to SP at Worlds and nationals was more like aiming to get enough points for applying for college, not going to int. competitions. During her absence during 2011-12 season, two participants from S.Korea decreased the World spot to one. She was the only one capable of increasing World spots back during her era.
Yuna had strictly followed the rule because she she had never been off the podium at World as you know well. She had to compete at Nationals in 2012-13 season because she didn't compete at Worlds in the prior season and the federation didn't give her a bye because they were strict and stick with the rule. However, as a reigning World Champion, Yuna didn't need to show up at the next year's Nationals, but she wanted to show her gratitude for her country and to draw people's attention to the minor sport before the Olympics, so the public could see her at Nationals at a cheap expense. The two Nationals in a row were the first time to sell a ticket to the public and the competitions got sponsored by companies in S.Korea.
It is also well known to her fans that her federation almost forced her to participate in Worlds 2010 and 2011 because they wanted to nail the 2018 Olympic bid by using her image and saved the federation's face and etc. So are all her sacrifice and hard work for her country worthy of being called, "the height of arrogance" by you? You can't pretend you cared about S.Korean skaters' World spot which was virtually earned solely by her during her era.
Since you are awaken from your ignorance, I hope you refrain from spreading your own tilted assessment. At the same time, I don't get your point against Caro's willingness for competition at all in this thread. You also need to brush up your memory about how people, even from his nation have reacted to Plushenko's gifted acquisition for the only Olympic spot instead of the reigning National Champion, Kovtun who also participated in the World 2013. What an irony it indeed is since you're speaking about "the height of arrogance".
lol
I didn't read anyone complaining about it when Yu-Na was sent to Worlds in 2011, and just in the same way if Carolina earns the minimum TES and is in good form, why shouldn't she be chosen above skaters who are simply not at the right level? Giada Russo (who btw is a lovely skater with many good qualities) doesn't have a 3-3, doesn't have 3F or 3Lz, it is very unlikely that she could place well at Worlds at all, or even qualify for the FS. Roberta certainly has a better chance (since she has a good arsenal of jumps and has been skating well this season) but again if Carolina shows to the Italian Fed that she has a better chance to earn two spots why shouldn't they send her? This is a sport, and placements, scores, skills matter, not moral or sentimental judgements. 
