It's not an easy thing speaking out about sexual violence or coercion. I would not blame anyone for wanting to move on with their life, given how victims of genuine abuse get treated after they talk about it. I've seen it and I've almost been through it as well I guess and the response was less than stellar from everyone from the employer at the location to my own family's attitude towards calling the police (i.e "don't bother, you've no decent evidence"). Going forward as a witness in a criminal investigation can be grueling, and rather than support there can be hostility. Do what is best for your own safety and sanity, first and foremost, I would say.