"On the other hand he was much more confident delivering what I think is the strongest JW argument for living in the "last days". That's the observation that WW2 is pretty much the worst war humanity can ever expect to fight without ending civilisation itself. So therefore the end must come before a future war escalates into nuclear holocaust and the end of humanity."
Again it's a non-sequiter.
But anyway let's start with WW2 and it's scale. Surprisingly there are wars from before 1914 that run it close in number of deaths and casualities.
The Taiping rebellion of the mid 19th centurty has various estimates between 20 and 100 million deaths.
The Three Kingdoms war of 3rd century AD has various estimates between 36 and 40 million.
The Mongol Conquests of 13th and 14th century come out at 30 to 40 million.
So plenty of wars to link to bible prophecy. And as a percentage of the world population these wars are "bigger" than WW2.
Now also why should a "future war escalate to a World War and thus to nuclear annhilation?" If it didn't 1962 and the 1970's and 80's when nuclear weapon stickpiles were three times as great? Just because it could doesn't mean it will.
And as mentioned above - we have had 72 years without war on the scale of WW2, WW1 and the wars I have mentioned above.