Reading through some of the answers here, many people incline to quickly judge everyone.
First of all this is a real serious and deep matter with a lot of different perspectives.
Bullying is never okay and the bullied one should always be protected. But it is not always easy to see.
First: Who bullies and why does she bully? Is she pressured herself (by managers, company, parents, society?) and gives the pressure on to the next person? Does she intend to bully the other one becasue the doesn't like her or does she just expect higher standards like her own from others and pressures them in a harmful way? Is it just reduced to an individuum or another group? Maybe the bully das social psychopath tendencies or she just can't cope with managing a whole group.
We just got to see the view of a bullied years after the accidents happened. A simple not harmfully meant comment like "eat something, you look too thin" (maybe out of worry for the other not to get bullimy) can be understood as "I want you to be fat and ugly".
It is obvious that many mistakes were made and it always gets worse for any victim if she/he doesn't talk about it. It is really easy to look away and to be honest the awareness for such situations is growing in the last years, but you will always have such cases at work or school.
Even when you know that some bullying is happening (for example in a class) you only have limited possibilities to stop it (as teacher, student, bullied) alone.
It is easy to judge others, but hard to find the right solution in their situations.
We don't know the whole story and we should not overjudge without knowing more.
Given that Jimin had to go I guess more members or ex-members came out and supported Minas claims. Without this getting public knowledgenothing would have happened.