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I can understand why somebody would shut down after an experience like that, but not at the age of four. I thought the parent was a how a child could tell right from wrong until age seven.
Two problems with that.
Firstly, the research shows pretty clearly that 4 year olds have a sense of right from wrong, and it does not depend on parental rules. Research has found that children as young as 3 or 4 (basically as soon as they can understand the questions) describe a difference between things that are against the rules (but the rules could change) and things that are wrong regardless of rules, and consider things that harm others to be wrong regardless of rules. Research into autistic kids has also demonstrated that this moral/conventional distinction has no relationship with theory of mind performance.
Secondly, a kid doesn't have to know something is wrong to be hurt by it. Abusers often convince kids that the abuse is justified in some way, telling them they brought it on themselves, or it's an expression of love, or something like that. And many kids believe this, and don't realize what happened to them was actually abuse. However, they still show the exact same cluster of psychological problems associated with abuse - low self-esteem, acting out, body image/eating disorders, anxiety and depression, dissociative disorders and so forth. In fact, if anything, it hurts worse for these kids, because they blame themselves and have no framework to explain their problems.