Jesus recognized that the very nature of the kingdoms of this world, demands that they be defended with armed might. The hardness and greed of unconverted human hearts, sometimes seem to understand nothing but the language of force. The sons of God can live a life of love for their enemies, but the sons of men are living under the rule of Satan, and are governed by the law of force. The masses of this world will not allow God's Word to control their lives, and therefore they must be held in control by the sword. Both the Old Testament and the New Testament recognize the authority of the state to maintain order by the use of force.
Pacifism covers many types of opposition to warfare.
It is Satan's counterfeit for the doctrine of nonresistance. True Christians have never advocated the doctrines of present day pacifism. The peace-emphasis promoted by most leaders within the churches of America today, is not the doctrine of nonresistance taught in the Bible. Nonresistance describes the faith and life of those who accept the Scriptures as the revealed will of God, and who cannot participate in warfare because their Lord forbids it. He teaches the law of love.