This ban treaty while toothless, is important in that it highlights the pariah nature of those countries that possess large nuclear arsenals and therefore hold the entire world hostage to destruction. Mankind paradoxically has the intelligence to make and the stupidity to keep such powerful weapons. They do not make anyone safer, yet this idiotic argument is parroted continually by so many. Your only "safe" until the ball drops and the world explodes. No other event in  human history has a parallel with this potential and increasingly likely future occurrence. Nobody can truly comprehend the unholy hell of such an event.