Well that's a strawman. That is not a belief I hold and no where did I claim or imply I did. There's nothing in my comment, or in von Neuman's stance that I'm aware of that, that endorses world domination. I also don't see any reason to evoke the emotions associated with the word genocide either...
What I believe is that preventing development and possession of nuclear weapons by other nations would very likely lead to less deaths over time than nuking Russia would have. Are you really not concerned that we as a species may eventually wipe ourselves out? I am.