I think the husband in the movie has a lot of responsibility, Reivew on We Need to Talk About Kevin

The mother has postpartum depression at a glance, the baby's cry and other things that normal people see as unreasonable to happen to the baby are invisible pressure and burden to the mother. Maybe she wasn't ready in the first place, just mechanically imitating the actions a mother should have. But she didn't realize that she subconsciously had feelings of resistance to this new life.
But the husband didn't realize what was wrong with his wife, and just said "it's nothing". When the wife heard these words, she would only feel more incomprehensible and helpless...
Time passed slowly, and the son gradually realized the indifference of his mother to him, so he rebelled.
At the same time, in front of the camera, we can't see that the mother and son have sufficient communication and exchanges, and they are all "understanding", which undoubtedly accelerated the speed of the two running in opposite directions.
What did the husband do when faced with the twisted relationship between his wife and his son? no.
When you find that something is wrong with yourself or your relatives and friends, it is best to seek professional help and intervention.

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