Violence without intelligence, is survival. With intelligence, we are able to delineate what violence is needed, productive violence from senseless, unproductive, unethical violence.
The dividing line for violence is debated, but evolving. The more emotionally and logically intelligent we become, the less we value violence as an effective tool. This is empirical, no need for an opinion here.
One can rationalize that increasing the coefficient of intellegence will lead to an increase in the our consideration of violence, as senseless violence. Thus critical, empathetic thinking is the primary factor in further limiting violence in our society.