The only peace to be fundamentally concerned with is peace with God, all other fruits of peace come subservient to this first issue. Peacemakers are those who assist in bringing others into the Peace of Christ by being Christs hands and feet in this world. Not by bringing their own message and their own ideas of Peace, they bring Peace not through subjugation of a physical kingdom but by wielding a sword of a spiritual kingdom. That sword is the sword of the Spirit, and the armor is Ephesian. The church, and its members are not pictured wearing armor coincidentally in Ephesians, this is Hell Storming gear. When the Church and its members are suited up so to speak, then that sword is being used. It is the only sword of reconciliation, it is a sword that brings peace of the heart because it divides asunder the sinful from that which is to be reconciled to God. We are citizens, if the Spirit is in us, of the only kingdom existent, which is capable of actually accomplishing peace. This is why many today need to repent of so many false gospels, false ideas, false application. They are bearing not the sword of the Spirit, but more of an earthly sword...one that causes division, strife, ignorance, and has no capacity to damage a hell-gate whatsoever, for it is made more of something earthly in composition rather than something of Spirit.
Jesus reconciled the world...we are to bring people to that reconciliation. This is peacemaking supreme. The kingdoms of this world can choke on all the peace they promote, for it is peace without Christ, which is no peace at all...