No, this is true. Statistically, we know many serial killers are actually victims of brain trauma as children (usually through being violently beaten) and we know traumatic brain injury can cause aggression. In fact there's a predictive relationship between childhood trauma and juvenile psychopathy. [0]

0. https://pubmed.ncbi.nlm.nih.gov/29598432/ " Results indicate that psychopathy is significantly correlated with childhood trauma. For the Missouri data, trauma significantly predicted psychopathy scores for both boys and girls."