>there needs to be a formal investigation to determine if allegations are credible or not

I think some folks are confusing sexual harassment with sexual abuse. One requires a criminal investigation with due process rights regardless of the accused's place in life, the other needs only credible allegations. For a solitary accusation, there may be a need to determine credibility in an accusation but when there is more than one accusation a pattern of behavior has developed and credibility runs in favor of those levying the accusations.