Jimin wasn't given a choice to stand up for herself. Public opinion was already in favor of Mina. Do you think that if Jimin actually tried to defend herself anyone would have believed it? No, they wouldn't, because a lot of people's first instinct is to choose sides without waiting for more information. If people had waited until now to make a conclusion on the case things could have been a lot different.
We've seen that Mina isn't as innocent as people initially believed. She's manipulative and she does whatever she can to try to manipulate public sentiment - going so far as threatening suicide. I genuinely don't understand what you expected Jimin to do in that kind of situation. Defend herself and risk a member she's trained and worked with for years to commit suicide? Mina wanted to destroy Jimin. That much is obvious because even after she's left the industry Mina STILL won't leave her alone.
No innocent person will accept those accusations. it's as simple as that.