Earlier quoted context omitted.
>There are 9 nuclear-armed states today. Likely this has set us on a path where nuclear war is inevitable. It's really hard to guess how retaliation would happen in practice, a large-scale nuclear war certainly isn't inevitable . The most likely targets for nuclear strikes right now are also non-nuclear states.
People massively simplify the dynamics of launching a nuke. If Russia launched a nuke on a Ukrainian military target away from civilians there is virtually 0 chance of nuclear retaliation. Ukraine doesn't have them. Does anyone think the US, France, etc. would nuke Russia? Of course not. It's scary, but in some scenarios one nation can absolutely nuke another nation without threat of getting nuked themselves. In real…
Game theory works when players know the payout matrix. When the assumed payout matrix is shown to be false, you get very chaotic, almost random results, because you can't assume that your opponents will correctly choose the rational choice. With WMDs, the consequences of that can be deadly. That's why both nuclear proliferation and "limited" nuclear war are such fraught choices, and why the major nuclear powers have worked so hard to avoid them. They've run the game theoretic simulations and understand that it doesn't lead anywhere good.