"...women who kill serially are much more practical." - Yay?

I blame the patriarchy, naturally.  Japan's 'Black Widow' Arrested Again After Poisoning Her Eighth Male Victim | Broadly: "Dr. Scott A. Bonn writing at Psychology Today. Unlike murders committed by men, murders committed by women aren't typically motivated by sexual or sadistic drives. Bonn asserts that women who kill serially are much more practical. "Female serial killers are much more likely than males to kill for financial profit, comfort or revenge," he writes."