I know that right now, probably no one wants to be in Iraq, and I understand fully what would happen should the foreign troops be transferred away - full-blown civil war is among those options, as is an escalation of the conflict. No one probably wants that either except weapons industry lobbyists. What I was referring to was not the occupation itself but instead this:
we don't have dreams of mass conquestFirst - who is "we"? US citizens? I don't doubt that. But I also don't think that Iranian or North Korean citizens have dreams of conquests. Governments and leaders are a different thing. Your president is on a mission from God, so I don't know what he's dreaming about, but he and his government did want to go to Iraq so badly that they apparently made their own intelligence agencies to manufacture suitable intel reports etc. to support the official motive of the war. I don't really know what the real motive was. I suspect it was to create more instability to the world so that the horrorist* regime could gain more power.
Secondly, whatever the motive was/is/will be, they did plan for invasion for a long time, so I think that counts as "dreaming" about conquest. Not necessarily mass conquest but conquest nevertheless. At least to this day it has effectively been a conquest instead of claimed liberation.
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I know the difference between genocide (attempted or committed) and mass homicide.
All genocides are mass homicides, but all mass homicides are not necessarily genocides. The difference is in motives only, though - results are the same, as should be consequences. Using a nuclear war as means of genocide is not really very much different from using it as means of simple mass destruction, because both require willingness to kill a whole bunch of people that don't really deserve to be targeted - ie. civilians.
Thus it doesn't make much difference what the motive behind the use of a weapon of mass destruction is. Result is mass destruction anyway.
Fire bombing in Germany and Japan would by current standards definitely be deemed a war crime and mass murder of civilians. It was not a genocide, though, because the motive was (mostly) to disrupt the important military factories in those cities, although collateral damage was huge... By the standards of the day, it wasn't a mass murder nor a genocide, it was a military operation that demanded a lot of civilian casualties. Fire bombing of Japan was a more hairy business though. But even that was not a genocide. Just mass homicide. Intended civilian casualties are not a part of well-managed war in any case. It's a terrorist action and war crime, unless the target really is military asset and civilian casualties are collateral damage (of reasonable scale).
Anyway. It doesn't make sense to try and dig up WW2-era precedents, because they don't really apply any more. What matters is today's standards and international rules of warfare.
Using a nuclear weapon against civilian population is as far as I know, mass murder and war crime by today's standards. If the motive is genocidal, using a nuke can also become attempted genocide in addition, but the result for said civilian population is all the same, and it rides on a pale horse. And, since it's practically impossible to use a nuclear weapon without huge loss if civilian lifes, any use of a nuclear weapon should IMHO be considered using it agains civilian population. What kind of military target would demand a nuclear strike to be destroyed? If it's so well defended that it demands a nuke, is it worth destroying? What other damage the nuke will cause other than destroying the target? Currently, I can't think of any target that would really demand use of nuclear warheads.
there is a difference between using a nuke to bring a country to it's knees and using a nuke to kill every last one of 'the vermin'. if you are unwilling to see that difference then I don't see how you can hope to make any sence of the world or take part in this discussion.
Obviously there was a big difference between forcing an issue with one or two strikes as US did to Japan, and glassing the whole country. But that happened in a full-fledged war between originally almost equal opponents in the middle of a world wide warzone. In today's world, I can't really think of a conflict where it would be necessary or acceptable to use nuclear weapons to force a surrender. Nor that it would work very well anyway.
Let's imagine a war between France (a nuclear state) and Germany (not). So, France and Germany end up having a private war on their border that threatens to escalate and eat up both countries' resources and reserve soldiers. Conflict proceeds so that France ends up slowly gining ground (as if). Anyway, France then decides to force a surrender by nuking some German cities and tries to justify that by saying that Germany wouldn't have surrendered, and an invasion would have killed more people in the end.
This is completely absurd of course, but it does make clear what my opinion is.
Synopsis.
In this time, it's not possibly to use a nuclear weapon in military operation (or any other WMD for that point) in a way that I could accept. The motive does not really matter to me. Conventional warfare is entirely different matter, since it's way easier to direct that away from civilians.
Regardless of whether someone uses a nuke to force a surrender, or to commit a genocide, it's unacceptable to me in both cases.