What’s the Deal With This Movie?

Were they all insane? Were the “kids” clinically insane as in they didn’t know better since they were children & were brought up that way by Mumsy & Nanny? It’s the only way to explain how & why they were cold blooded murders. The only thing is they knew better how to frame the guy for the murder of the woman saying that he did it & they had the evidence against him. That kinda shows that they’re capable mental wise so a court would shoot down the insanity defense.

But still, I realize full well that it’s just a horror movie but I had to ask. Everyone in the house was a winner, so why or how could they come out any different, but man were they twisted! The guy isn’t any better either, how could he be fooled by them that he was a killer & that he couldn’t figure it out later on that they lied? Otherwise interesting movie.