We are under the new covenant sir. We are no longer under law. If you want to convince me it is acceptable to God that His people war, then give appropriate scriptures that were written to us under the new covenant. We no longer offer animal sacrifices either, but quoting the law on that would not be evidence for us Christians.
"And He said to them, “When I sent you without money bag, knapsack, and sandals, did you lack anything?”
So they said, “Nothing.”
Then He said to them, “But now, he who has a money bag, let him take
it, and likewise a knapsack; and he who has no sword, let him sell his garment and buy one. For I say to you that this which is written must still be accomplished in Me: ‘And He was numbered with the transgressors.’ For the things concerning Me have an end.”
So they said, “Lord, look, here
are two swords.” Luke 22:35-38
Jesus first sent them out with nothing - nothing to be stolen, nothing for them to be killed for. But then He sent them out with supplies, money, things that could be taken from them and and things that thieves would kill for, so He said, bring a sword to protect selves and their mission.
Since the beginning, evil needed to be restrained, stopped and in some cases of life and death situations, God allows killing to defend yourself. The Bible does not say, "Thou shalt not kill", the correct translation for that word is "murder". Murder has a different motive then self defense or in some cases righteous war. We have police that kill people in gun fights if citizens lives are threatened, it is legal and it is ordained by God to put down evil and stop it.
Besides all that, we have a spiritual war going on continuously since the beginning. Michael, the archangel, will stand up and fight a righteous war against Satan and his demonic horde and all the army of the angels will battle as well. (Rev. 12:7).
Until evil is put down and Satan and his horde locked up, we are all given rights by Jesus to protect ourselves, our families and our property.
God formed governments with armies and police. Did He tell them to put down their swords and just carry the Bible? What good would police be if when they got a call about a shoot out at a bank, with hostages if they were told to just bring their Bibles, prayers ... turn the cheek when the criminals shoot at them and shout out prayers and forgiveness before the criminals target their cheeks and blow their heads off. Yeah right.
War against evil will continue until Christ returns with the sword that comes out of His mouth and destroys probably up to five billion evil people and locks up Satan.