Einstein and many nuclear scientists and engineers that participated in the project felt betrayed by the U.S. dropping the bomb in Japan, they worked on the mak

Einstein and many nuclear scientists and engineers that participated in the project felt betrayed by the U.S. dropping the bomb in Japan, they worked on the making of the bomb, expecting that it would serve as a deterrent, not as a weapon. Because of this, some fled to the USSR and China. But even if the scientist/engineers wanted to stop the use of the bomb after working on it, they couldn't have, because it's a political decision. That's why this has to be stopped even before the weapons race starts, IMO.