Another aspect of a WW3 is that people- pretty much ALL people everywhere- who have nothing to do with the war will find their lives threatened or completely changed by it.
I'm less concerned about nuclear escalation than about biological escalation.
It's quite hard to destroy the human world with nukes: you can only blow up big chunks of it, maybe take out enough power plants and supply chains to drop us into a multi-decade or multi-century dark age, or maybe cause a nuclear winter, although the actual risk of that is unclear.
Whereas a year into a major war a kid in his/her basement can release something that is functionally the end of the human species.
We currently have no real safeguards against this. If we ever have descendants, they'll think we were insane during this time period and they'll be right.
I'm less concerned about nuclear escalation than about biological escalation.
It's quite hard to destroy the human world with nukes: you can only blow up big chunks of it, maybe take out enough power plants and supply chains to drop us into a multi-decade or multi-century dark age, or maybe cause a nuclear winter, although the actual risk of that is unclear.
Whereas a year into a major war a kid in his/her basement can release something that is functionally the end of the human species.
We currently have no real safeguards against this. If we ever have descendants, they'll think we were insane during this time period and they'll be right.