I can't tell you how much I disagree. It's in fashion to revolt at the imagery, but this is a horror tale. You wanted a straight drama. Don't bring a knife to a gunfight. The story here, that most critics don't seem to get (as if they didn't sit through it) is the contemplation of Evil and Original Sin writ large in the female avatar of Gainsbourg.
Whether the point of view, which is the male omniscient, likes it or not, "She" is obsessing on Evil, and concludes herself to BE evil. Every review I've read opens with the toddler falling out the window; no review I've read mentions that she KNEW he was going to, and did nothing to stop it. THAT is the crux, the center, the locus of the movie. Having done that, and having incorporated what that means to herself internally, and everything else makes perfect, logical, inevitable sense.