When our Lord Jesus Christ came into the world, he came as a peace maker. He helped those who were helpless. He provided for the needy. He healed those who were sick. He preached the message of peace and harmony. He cast away devils from people and make their lives peaceful. Jesus Christ was a perfect example of peacemaker.
The love of God in our hearts will make us peacemakers. When we yield ourselves to the Holy Spirit to do that which is good for our fellow humans, we are going to be peace makers. Peace makers are those who do good to others.
People who are wicked are not peace makers. Those are the people whom the devil has encoded evil ambitions into their hearts. They have wickedness and evil in their hearts. Such are not peace makers. To be peacemakers, God will make our hearts regenerated to conform to the doctrines of God.