Ideally we can call uopn The Lord to defend us, and if our cause is just, He may indeed miraculously act on our behalf...I've already seen some relatively small examples of this happening in my lifetime, and look forward to beholding greater examples as harmony with His Holiness is enhanced and increased.
Something really radical occured between the Old and New Covenant.
Under the old - mainly the physical descendants of Abraham through Isaac were the 'chosen people'...therefore great value was not always placed upon the lives of foreigners. ( To put it mildly.)
But under the new, Christ atones for the sins of the whole world, opening The Way for all races and nationalities to become the blessed, the favored, the chosen of God.
In the old, killing a foreigner was sometimes considered roughly the same as killing a vile, wild beast.
But under the new, any killing of a person - is killing someone for whom Christ died, someone He has sanctified by His shed blood.
And who can say, if one who was killed, would not have come to believe unto salvation, if they had not been killed ?
Can we find the repentance we ourselves need, if we cut short another's God given space to repent ?
But if they're cutting others lives short....that's where it can be troublesome.
Ideally we could pray and God would rebuke them, as no other can.
But if / when our faith fails to move God, so to speak, then we're left to our own devices, which tends to give place for a measure of uncertainty and doubt.
Which is one more reason to seek that sacred walk with The Lord, wherein we are consistently in such a spiritual, holy, place that The Lord Is our ever present Defender, Protecter, Avenger, Deliverer. Amen.
wm