I understand where you're coming from with feeling like maybe people here don't believe you. However, there are unfortunately many, many people here who have been harmed either by a therapist or multiple therapists or whose experience has been so uniformly negative that they view therapy as an institution as harmful. I am not one of them (so far), but I recognize that being a therapist does not make a person some sort of saint who is incapable of doing immense harm, either intentionally or unintentionally.

I think it's sometimes just hard for people to understand how others can do the things they do. I know I find it hard to grasp how people have hurt me the way that they have - and I know for a fact that the things happened, so my difficulty isn't about not believing that what happened, happened, but about not being able to understand how people can do such harmful things to other people. I don't think Sarah literally meant she didn't believe you with her comment, though I understand that your experience has put you in a mindset where it's easy to take it that way. "I don't believe this!" is often used as an expression of shock and surprise, and it seems like that's what she was expressing, since she also points out that your therapists' behavior was unethical.

I hear you about the just world fallacy. I find it's best for me to not dwell on it because there's nothing I can do about it.