There is probably a generational difference in this.
Probably up to around 1980, if a teacher had received any psycological instruction at all, it would be either Freudian
And in the Freudian universe, actual life experiences are not relevant, and are to be studiously dismissed, it's all down to oedipal childhood fantasies, and if you're a girl, penis envy. Abuse never actually happened, you imagined it.
Or, the evil, kiddy fiddling*, BF Skinner's hardcore behavourism.
In both cases, the child was to blame and was to be punished for "misbehaviour"
I'm not sure that the current paradigm of medicalism is any better; if a child's behaviour is out, it's a chemical imbalance in their brain that needs correcting with lots and lots of prescription drugs.
I've been thinking about my own behaviour at school in the early seventies. My class was around the 40 kids mark all of the way through, it was only long after the peak of the birthrate wave had passed through that school that the political approval was given for more building and additional staff.
Even if the teachers had been on the lookout, I was in a big haystack.
My behaviour wasn't the worst, two children's homes, one with children who'd been taken into local authority care by the courts, and a sink estate of prefabs fed children into the school. I was labeled as lazy, and the label stuck.
I think that a couple of teachers at the boarding school spotted that I had problems, one probably recognised his own shit in my behaviour. We were a cruel bunch.
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Prof of animal behaviour, Temple Grandin, has gone on record about BF Skinner groping her leg, when she met him in her teens.