They must have counter-acts. They must witness peace in everyday action. Prejudices are clearly learned first at home, then at school, and reinforced within the culture. The cultural biases can only be dismantled by active rolemodelling against it. Peace is a set of skills.
Peace is an attitude.
The skills are useless and ineffectual when a person does not want peace. This is the firm rejection of violence. It is the belief that Peace is important and worthwhile. It is forgiveness for real and imagined wrongs. It is win win.