First, start with a boy, because males are the ones who are really responsible for the truly awful violence the world.
Then, from the day he is born, physically and emotionally abuse him. Especially have his mother and other females do it. The men can also engage in it or not protect him.
Continue it throughout his childhood. Emotionally and physically abuse and humiliate him. A lot.
Do it though middle school. The kids there, especially the girls, can ignore and humiliate him. Continue it through high school and until he graduates.
Then, make sure there are no good jobs available to pay a middle-class wage. Impoverish them.
Make sure there is no place to turn unless it’s prison. Give them psychiatric drugs, aka murder/suicide pills.
Blame everything on them. Make sure leftist feminisms says, “Men are responsible for all the problems in the world.”
Then sit back and watch what happens.
There is a very good chance that many of them will become serial killers, mass murderers, rapists, and abusers, almost all of it directed toward women.
All violence, to the violent, is an attempt to achieve justice, no matter how warped it is, since to them revenge is justice. All violence is in fact revenge, an attempt to replace feelings of humiliation with feelings of pride, defined as self-respect, self-love, self-esteem.
This is free advice courtesy of Turtle.