You said much more. I think it's fewer than 5.
"Most countries definitely do not have nukes. "
https://news.ycombinator.com/item?id=43209283
Also by my understanding, even 4 more countries having secretly nukes counts as "much more countries having nukes than officially known".
But my point is not semantics, but that even one nuke can trigger a chain reaction. Unknown nukes just makes this more likely.
"Most countries definitely do not have nukes. "
https://news.ycombinator.com/item?id=43209283
Also by my understanding, even 4 more countries having secretly nukes counts as "much more countries having nukes than officially known".
But my point is not semantics, but that even one nuke can trigger a chain reaction. Unknown nukes just makes this more likely.