Why Orient Express screenwriter Michael Green once "hated Agatha Christie"

This is an op-ed by the screen writer of Orient Express.
A refreshingly interesting story - some might enjoy it.

Before I wrote the screenplay for 'Murder on the Orient Express,' I hated Agatha Christie http://www.latimes.com/opinion/op-ed/la-oe-green-agatha-christie-orient-express-20171201-story.html Michael Green Dec 1, 2017 I’ve been asked in multiple interviews what my relationship to Agatha Christie was before writing the adaptation of “Murder on the Orient Express," and I’ve evaded the question or outright lied every time. The reason is: Because I hated her. Not her books, but her. ... ... Theoretically scarier movies with monsters were cartoonish, exaggerated, whereas Christie’s characters were ordinary humans. They had human motives and limitations, and they did terrible things. The film didn’t have a protective layer of genre. Perhaps if Ustinov had worn a more flamboyant mustache I would have felt at ease. But he didn’t, and I didn’t. “Death on the Nile" taught me that good people could be hurt or killed on purpose by other, not-so-good people. Christie introduced me to the simple fact of murder. She made me see the world was not as benign as I had believed. ...