Wasn't the motive that he was nuts? Also wasn't that explained several times that he was testing other fathers who couldn't ever save their sons? I mean maybe that isn't made as clear in all versions of the story but it seemed pretty clear that, although being a very thin motive, he was driven insane by his brothers death and his fathers complacency. I can agree that the type writer scene felt really off after the ending and was probably the biggest example of that choice not making much sense but other than that its perfectly fitting for a crime drama.
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