Here is what Jesus has to say about "love your enemy":
Here is what Jesus has to say:Luke 6:27-36 King James Version)
27But I say unto you which hear, Love your enemies, do good to them which hate you,
28Bless them that curse you, and pray for them which despitefully use you.
29And unto him that smiteth thee on the one cheek offer also the other; and him that taketh away thy cloak forbid not to take thy coat also.
30Give to every man that asketh of thee; and of him that taketh away thy goods ask them not again.
31And as ye would that men should do to you, do ye also to them likewise.
32For if ye love them which love you what thank have ye? for sinners also love those that love them. 33And if ye do good to them which do good to you, what thank have ye? for sinners also do even the same.
34And if ye to them of whom ye hope to receive, what thank have ye? for sinners also lend to sinners, to receive as much again.
35But love ye your enemies, and do good, and lend, hoping for nothing again; and your shall be great, and ye shall be the children of the Highest: for he is kind unto the unthankful and to the evil.
36Be ye therefore merciful, as your Fatheralso is merciful.
and some more:
Matthew 26:52
“Put your sword back in its place,” Jesus said to him, “for all who draw the sword will die by the sword.
Matthew 5:9
Blessed are the peacemakers, For they shall be called sons of God.
Jesus answered, "My kingdom is not of this world. If My kingdom were of this world, then My servants would be fighting so that I would not be handed over to the Jews; but as it is, My kingdom is not of this realm."
John 18:36
And His faithful disciples harmonize with Jesus' word:
For though we live in the world, we do not wage war as the world does. The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds. We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ. (2 corinthian 10:4-5)
Romans 12:17-21
17Repay no one evil for evil. Have regard for good things in the sight of all men. 18If it is possible, as much as depends on you, live peaceably with all men. 19Beloved, do not avenge yourselves, but rather give place to wrath; for it is written, "Vengeance is Mine, I will repay," says the Lord. 20Therefore "If your enemy is hungry, feed him; If he is thirsty, give him a drink; For in so doing you will heap coals of fire on his head." 21Do not be overcome by evil, but overcome evil with good.
II Corinthians 10:3,4
"For though we walk in the flesh, we do not war according to the flesh. For the weapons of our warfare are not carnal but mighty in God for pulling down strongholds."
Ephesians 6:12
"For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places."