Bad Police Work, and mystery solved!
Just saw this film, and maybe I've seen too many eps. of Law & Order SVU but the police work after the girl's rape was atrocious.
First, they really had no grounds to arrest Baxter, and the never asked or did police work 101. The easiest way to see if Baxter may have been the rapist was to to show the girl some mugshots with Baxter inc. Since they never implied he was masked, traumatized as she was, she would have been able to finger him.
I personally do not think Baxter was the rapist. In fact......I believe Johnson was! That is why (1) he found the girl so easily. (2) the girl was frightened of him. I DO believe he blotted this out, but couldn't help the recurring memories. Maybe he was schizoid by this time and really had multiple personalities.
another clue is when he was telling Baxter what kind of man he (Baxter) was...and you really knew he was describing himself.
I also wondered about his total breakdown and crying in front of Baxter... Was Johnson really seeking Baxter's help, or was he trying a tactic seen on Law & Order SUV, where Elliot tries to play perp by making out he has similar feelings. trying to gain trust and hoping the perp will confess.
If you are wondering why Johnson kills Baxter, it was to cover his own tracks. By Baxter not being able to give a true accounting of the events..that he was innocent, Johnson is able to pin the blame on the suspect. If this seems somewhat contradictory, it is, because Johnson himself was unaware of his "other" self except in bits and pieces that entered his consciousness.