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That's not the right question. If innocent, non-violent lives were lost, then no, those deaths were not "righteous" or "justified" by masturbatory ideas of a "greater good." This is collectivist jargon used to bamboozle people from their original and accurate understanding.

Well you just answered the question. You think we should not have fought in WW2. I differ, but I respect your point of view.

This is of course the great story of the American statist religion. Should the American government have given escaping Jews back to Stalin? How did Hitler rise to power? How was Germany is such dire straits to turn to such a nationalist monster? Treaty of Versailles maybe? WWI perhaps? A war started by monarchs (related monarchs) and blood-thirsty, self-important leaders who drafted millions to die in a war for nothing.

Hitler would have won, then. I wonder what the world would be like now, if we hadn't fought. We'll never know, but I guess it would be worse.

This is my pragmatic assessment. Pragmatism sometimes clashes with other ideals.

A bit off topic But I wonder what the world would be if they would have killed the man on the right, right there on the spot. But somehow the "leaders" never kill other "leaders". Really strange, not pragmatic at all of those "leaders"

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There is a cost to dishonor. I don't think it's clear that the expediency of killing one leader outweighs the cost.

It might be the case that the one leader you kill is succeed by a worse foe.

Might be. This could also be said with adolf hitler, in mind killing (earlyer on) him might have had that same effect too. That does not mean you can not kill proven dictators.

English is not my native language. So I hope I understood your first sentence correctly
I don't now what you mean exactly with dishoner. Do you mean it is dishonerable for one leader to kill another? Leaders don't kill eachother they talk?

It is mutually beneficial for them to talk without killing each other, and it is beneficial for the soldiers.

I don't see how it's beneficial for the soldiers. If they can't talk or don't talk, or they are just warmongering dictators, they don't care if the talks have the outcome of peace. Do you really think that two tyrants, who have no problem with mass murder, or sending man to kill the men of other country, or to be killed by the men from another country, will prevent wars.
Those people don't care.

"Leaders" don't prevent wars, they make them.
It would be beneficiary for the soldiers of both sides, to go talk to each other on how to prevent their "leaders" from escalating war or mass murder.
But I guess the order followers of both tyrants, listen to their tyrant, when the tyrant order; go over there and kill a bunch of people.

It's beneficial for the soldiers in terms of preventing unnecessary bloodshed and suffering. Geneva Convention, for example. Not to mention, neither side wants to lose soldiers, so if two sides are headed toward a massive clash with heavy losses on both sides, it could behoove both sides to avoid that situation with diplomacy.