Re: Testosterone
https://www.ndtv.com/world-news/david-kozak-man-behind-prague-university-shooting-was-excellent-student-4721080
>David Kozak talked about planning a school shooting on the messaging app Telegram, treating his channel there like a "diary" of his life "before the shooting." "I want to do school shooting and possibly suicide," he wrote in a post, as per the Telegraph, adding, "I always wanted to kill. I thought I would become a maniac in the future."

How come not a single woman has such thoughts?
Men don't need a reason to kill.
Testosterone is the voice in their head telling them to murder.