The nations do that right now in allied wars of Global NATO and others. And those roots go back to Nimrod of Gen10-11. And everyone now can research exactly what Canaanites practiced as organized child sacrifice as part of their conquest priorities.
So not as a justification, but at that time in human history if one did not have the likes of Samson and David as all around a$$ kickers upon people who wanted to come in and burn your children to Baal or Molech, as a dedication to ancient Nimrod, that is exactly what happened. So we cannot know all the details of what was a war of serpent seed spreading that also occurred in Genesis 6, according to the Bible record, and if one is going to play Christian, one might as well respect the central rule book.
This is not jusitification it was a sign of those times. But Christ changed the story. Although having the ability to call on "twelve legions of angels" of which only one could wipe out all Italy and Jerusalem proper, he sacrificed his own life to seal the changing of the times, not for the world, but for people of God.
The world still practices all of the above to enrich the central finance, technology and industrial complex with also needed supplies and fuel (like oil and more capital) to continue the same pattern from Gen11. Being Christian now means laying down the sword if one really wants to actually follow Christ, so God's permission of war was for a greater purpose. It is not God today, but politicians who command wars with aid of various philosophers and religious leaders, ultimately for the central top internationalist financiers. It is all about power and money to continue the conquests later.
Thus God separating a peaceful people, also keeps them free of the actual implications of what war really is, not what they tell everyone is the reasons. Since even before WW1, but especially since then, all these powers have directed resources to more war potential. (Isa2:1-4; Joel3:9-12). It is not the international bankers and financiers that fight those wars, it is they who get richer and expand the operation due to them.