The Exorcism of Emily Rose (2005) - the movie

I don't have a problem with Hollywood making a movie about a fictitious exorcism, but this "horror" movie is based on the true story of Anneliese Michel (and is billed as such). According to Wikipedia, she was diagnose with grand mal epilepsy, and showed many symptoms of mental illness. According to an article at Movies Online, Anneliese starved to death and her parents and the exorcists were found guilty of manslaughter. This appears to be a case where superstition kept a woman from receiving proper medical and psychiatric treatment. This is a step back in the way the mentally ill may be seen/treated. I'm all for fictitious movies about exorcisms, or whatever you want to watch, but why tout it as being based on this story?