In the film, except for the doctor who was killed by mistake, everyone was killed by Norman. This should be the director's original intention, so as to make the statement of split personality more impactful. It's just that in the process of Norman's murder, various details have been interspersed. The director's intention here is to interrupt people's thinking and cause greater suspense.
The reason anyone else isn't the murderer (mostly the two old ladies) is simple, lack of motivation and inability to deal with bodies and vehicles.
Norman's biological mother and son have not seen each other for decades. There is no reason to kill, and the girl's mother would not kill to create an illusion to drive Norman crazy. This is too far-fetched. Everyone must understand that this is a murder case, and it would be too hasty to kill anyone with any motive. As for how Norman went out to kill while being shut down, that's the director's loophole. There are so many flaws in this movie!
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