issues like poor problem-solving skills, impulsivity, problems with regulating emotions, and poor self-esteem were found to be quite common in suspected perpetrators

Researchers also highlighted that migrants’ overrepresentation in sex crime could not be explained alone by social disadvantage, citing mental illness, antisocial behavior, the use of intoxicants, and a criminal past as other contributing risk factors.

What could it be... We just don't have a concept that can explain this at all. If only IQ hadn't already been debunked by marxists.