I question your premise. When has any nuclear power demonstrated, even rhetorically, a willingness to use nukes against civilians?
Other than August 6 and 9th 1945?
they were both military targets. Hiroshima was the military HQ for all of souther Japan. Nagasaki was the most import port in the south and held a lot of military industry. There was other things at play, sure, but there was military justification for the bombings.
<again, I'm admittedly biased>
These types believe that if there are civilians present then it immediately ceases to be a military target. That's why it's so impossible to discuss anything with these people. I wouldn't even be surprised if they'd say Hitler's bunker wasn't a military target because his secretaries were there.
When you kill 80,000 people with a nuke, it's a civilian target. Ironically the Hiroshima nuke killed more US citizens than any other bomb in history.
Ultimately, if there's one civilian there, some people will say it's a civilian target. Otoh, if there's one soldier there, someone will say it's a military target. Thus, the whole military/civilian targets distinction is worthless. Everyone will have a different opinion. But we are the only ones who have used nukes in war, indisputably.