Sure, in a purely physical sense, I suppose they could launch a nuke, triggering MAD and Israel's Samson Doctrine and ending human civilization for no reason. Currently I think Israel, the US, North Korea, and Russia have a higher (though still low) risk of doing that. In that order, by the way, though I could probably be convinced to bump Russia up higher.
Fewer, because we would've been deterred from attacking them. Unless we decided to risk nuclear war, I guess.