Most killings are criminal on criminal, thus a disproportionate number of males. There are enough of the Wournos kind, and the Texas school girl, whose name I do not recall, to make such a plan useless.
Most killings are by people who know each other and a lot are family killings.
Yes, criminal on criminal, plus family & neighbor killings. Usually male, but not always.
90% of murderers are men.
That is a fact.
The problem is testosterone. No one has the balls to bring this up.