People who avoid all violence have often been time bombs waiting to happen, in my experience.

When something isn't taught, or its forbidden, or its hidden in a box on the top shelf in the parents closet, then people are attracted to these things far more than if you had a blinking neon sign. So, really the opposite is true. Non-violent only video games creates violence.

Similar to children and fire arms.
The ones with the lowest likelihood of using a fire arm badly are those who were trained with one at a young age.
The worst were those that were told never to touch daddy's gun.