The culture of saving face and not causing disturbance compounds the problem. For example, some married couples prefer to not know if their partner is cheating so as to not disturb the peace of the family. Fortunately, this is becoming more rare, but it is still an issue.
Edit: Not agreeing with the previous comment. Just mentioning where the idea may have come from. I don’t believe Korean culture impacts plane crash rates. When the chain of command and responsibilities are clear, Koreans make stuff happen. It’s actually quite admirable. And cultural idiosyncrasies aside, people generally try to do what they believe to be the right thing, and not letting a plane crash is pretty right under normal circumstances