Evil? Not so much
Although there is plenty to be found here, this movie is not really about evil.
It's about incompetence.
In "Outrage", fabled prosecutor Vince Bugliosi attacks the unfounded trust the public has in the competence of our "experts". We need to believe our doctors, lawyers, accountants, police, prosecutors, and judges do their jobs well, even when there is scant evidence that this is actually the case.
The Manhattan Beach Police, upon hearing the (as-yet uncorroborated) story of the first alleged victim, sent letters to other McMartin parents asking if their children had similar complaints. Newsflash: that's not how you conduct a molestation investigation. Was there no one in the MBPD that knew that? Why not? Shouldn't there be at least one detective with some actual background in this type of crime? What do you do, when you don't know what you're doing, and you know you don't know what you're doing, but it's your job to know? Do you just pull investigation protocol out of your ass and wing it? Wouldn't the rational, responsible thing be to bring in an actual expert, one with LAW ENFORCEMENT EXPERIENCE in child sex crimes?
Well, of course, that's what they thought they were doing. They brought in Kee McFarlane. They either didn't notice, or didn't care, that she was 1) not in law enforcement 2) had no credentials 3) had something to gain from an amplified investigation and 4) was a total quack.
And that's the crux of it. In the world of Oprah and Phil, everyone's an expert. They're on the teevee. A psychologist with a P.H.D. and a state certificate, a psychiatrist with an M.D. and years of internship, Dr. Laura with a BA in physiology. All equal. Right?
If we no longer hold any standards for our society's "professionals", why should it surprise us that the institutions created to protect us don't either?