This is what happens when you try to 'sweep things under the rug.' It'll just be bigger and messier when it comes out again.
Since last year the government has been doing things to better safety in Korea and yet, it's still obvious things are shady and off. So, why wouldn't people be so explosive?
https://www.amnesty.org/en/articles/news/2015/04/south-korea-clampdown-against-sewol-ferry-anniversary-protest-an-insult-to-the-victims/