It's scary how real psychopaths( serial killers, cannibals...) look like you and I. They are a lot harder to recognize physionomically than usual criminals driven by drugs, gangs and so on. You would be a lot more likely to listen to them if they ring at your door... I don't know a lot about this trial but I saw a documentary and this girl is really firghtening. If she wasn't the one with the knife, she was watching and enjoying the show... PS: I would still do her of course.
I agree. It's not the weirdo's you have to watch out for, one look and you pretty much know they're fucked up. It's the normal guys.