By the time the flood wave rolled past Baghdad and exhausted itself, as many as one and a half million people could be dead.
1 - http://www.newyorker.com/magazine/2017/01/02/a-bigger-proble...
While a dam failure may kill more people, a nuclear disaster can leave a place uninhabitable for a thousand years. Radiation sickness and damage is also arguably scarier to the public than risk of physical harm from a dam failure.
A lot of people have some religious argument against Nuclear power - I'm not one of them, but a lot of other people seem to downplay the real risks.
Now im being downvoted because dams kill more people when they fail. I'm sure they do! But that doesn't change the fact that [people other than myself] will continue to oppose nuclear because of its negative PR
> Its failure in 1975 caused more casualties than any other dam failure in history at an estimated 171,000 deaths and 11 million displaced.[1] The dam was subsequently rebuilt.