I don't think they were so dumb. Nuclear power -is- good, and radioactive isotopes have helped me a great deal because docs have used them in scans to help me. However, where there is great good, there is also capacity for great evil. People have seen instances where nuclear power ( accidents) and nuclear weapons ( testing and otherwise) have caused great harm to others. It's no wonder the anti-nuclear folks were/are afraid and angry. We -do- need nuclear power now, because the energy need for our many modern advancements requires much, and other methods don't seem to be working well enough. We must be careful to keep old power plants safety checked, try our best not to build them in areas where natural disasters could cause accidental releases of radiation into the water, soil, or air and guard plants from being taken advantage of by enemy combatants that would turn our "friend" the atom into a destroying angel.