In some societies "maleness" manifests as a mental disorder

The man allegedly seized a knife and stabbed and killed a saleswoman and two more women in the store. He then injured five other women and a child [presumably female] on the street and in a bank.

The three people killed in the knife attack in the German city of Würzburg on Friday were all women, police say. The 24-year-old suspect, a Somali immigrant, grabbed a knife from the kitchen section of a department store, attacking several inside. He then lashed out at people outside.

Police say the suspect was possibly psychologically unstable [Ya don't say!] and may have held extremist Islamist beliefs. [Religion per se does not create aggression-prone personality disorders. However, those with aggression-prone personality disorders (typically male) are often attracted to religionism.]