That would be if the US bombed every single inch of Russia. There was not that capability for a while. Not saying killing any people is okay, let alone millions or hundred million. But I don't believe the intention of a strategic first strike on the USSR was to kill every person. Knocking out 1/2 cities would have accomplished their goals, resulting in the collapse of the Soviet Union, and in their mind saving more millions from the believed inevitable global nuclear WW3. Again, not saying it's justified, you're just viewing this from the future where you can see the outcome.
The war plans in the 60s against an industialized nuclear power were very different than the war plans in the 40s when von Neumann was advocating this.
> you're just viewing this from the future where you can see the outcome
No we don't know what would happens if the US did that, because thank God they did not do it.
We saw that 2 cities in Japan was bombed with no retaliation (I'm aware the bombing itself was a pretend retaliation). If anything is to be learnt from that it would be the US can get away with killing people.
