Protests helped me realize what people dont say anymore: one nuke will cancel the species.
As to why no one's used nuclear weapons since WW2, it turns out they're not hugely useful weapons outside of a "total war" context. Too blunt an instrument; rarely do you wish to simply wipe out a few square miles and everything in it.
I predict the first use, if it happens, will be naval.
I wish it was 1979 again and i could have recorded my physics prof...
Doesn't the fact that hundreds of nuclear bombs have been tested without destroying the species hold any weight?
Perhaps the argument is the retaliation would be world ending but even that is not clear.