Pitting societies against each other when we all live on the same planet is appalling amoral trolling. I choose that we all survive together.

Starting a preemptive nuclear war with another nuclear super power is probably the fastest way to ensure the collapse of human society.

That cannot be the logical follow-through. A collapsing society can do its best to recover - a nuked and destroyed, murdered wasteland cannot.

Climate-precipitated societal collapse is surely preferable to all over a large-scale nuclear war that is suggested to have been unilaterally invoked, tantamount to murder of billions and multiple genocides. That kind of 'solution' has no place in reasonable discourse about climate change mitigation or adaptation.

It does not make sense to do that, unless you're a psychopath.

Psychopaths make up a very, infinitesimally small minority.

The world is not "full of" them.

You're a belligerent person, but you hold few facts.