We can lead by example. As governments everywhere become less powerful and less hostile the world will become a safer place and the need for atomic weapons will fade away. There is a broad spectrum of non-violent means available today. The boycott is powerful and effective against anyone doing business with the public. The electoral process is also available to express public disapproval of misguided policies.
Civil disobedience has a history of success mainly through the media attention it draws.
Polarization is reduced between people who want to do business. Violence will be reduced to its lowest point in an environment with the most opportunities to acquire and maintain wealth by nonviolent means.