Take a good look at the picture of the Castle Bravo test.  There is no better way to see how the best intentions, little by little, can produce catastrophic results.  Castle Bravo was one of the largest explosions humans ever created, and we should never do anything like that again.

The Republic of the Marshall Islands is acting as the conscience of the world, and the six countries, including the US, who will not "green light" their complaint are cowards.