I’d put refusing to coexist with Communists on that level, and they actually took over von Neumann’s home country.
There is an incredibly important distinction between fighting against the ignorant temper tantrum of your brothers and sisters and exterminating them all.
Neither did the US in 1950. You’re thinking of H-bombs, which didn’t exist until 1952.
> In general, if someone is trying to exterminate a population
Which is not, in the context of 1950, what von Neumann was advocating. He was advocating for the use of strategic bombing in a campaign to topple a totalitarian regime that murdered tens of millions of people anyway. Which is what most people agreed was a good idea with the Nazis five years previous.
There is no strategic use of nuclear weapons against a nuclear armed country. The plan was a war of extermination. Strategically at the time the majority of the military was in the GDR, not even in the USSR.
I'm not sure where you're getting a plan to drop hundreds of nukes on the Soviet Union in 1950 from Von Neumann--source?
In any case, these weren't hydrogen bombs. There were probably hundreds of relatively legitimate military targets in the USSR in 1950 that could be usefully attacked with nuclear weapons with yields in the tens of kilotons (versus the hundreds to thousands of kilotons of hydrogen bombs). It's a big country and you could drop hundreds of nuclear weapons in the right parts of it without destroying population centers. The Soviets themselves did that with their own testing.
> There is no strategic use of nuclear weapons against a nuclear armed country.
Which the USSR barely qualified as in 1950. Plus, they had few reliable ways of delivering those nuclear arms to US soil. That's the point of attacking them in 1950 as opposed to waiting until they had a large nuclear arsenal and the ability to reach the United States.
In general, if someone is trying to exterminate a population, then I believe that they fall under the lunatic umbrella, and that the umbrella should come down like a Venus fly trap and gobble all of them up. On balance, if we did this to every such person throughout history, then history may have fared better. There are zero populations of humans that need an exterminator (at least, an exterminator of humans).