I can understand people who want an apology. I don't condone the method though. These people don't live in a far away country. They all know where Soojin works, maybe even where she lives. They can easily go to her place, talk to her, see if she has changed. But they don't. Which tells me they're not out for an apology, they're out for a petty revenge. So I can't have much sympathy for them. There are other ways to do things. They didn't even try (we would already know otherwise).
I don't think the responsibility should be on the victims to seek an apology..... it should be on perpetrators to give one if they've truly changed and become better people.