Still, n * 1000 deaths (in n years) may rationally be preferable to m deaths once, even if n * 1000 >> m
Risk assessment is a funny thing. Economists and psychologists have done great experiments along these lines.
It's not even spread out that much. Worldwide, coal kills more people in two months than nuclear ever has, and that's including nuclear bombs.
Do you have a source for this?
Quick summary of figures: in 2013, Germany suffered 1,860 deaths due to coal plants in Germany, 1,770 deaths due to coal plants in other countries, and German coal plants also caused 2,490 deaths in other countries.
There are probably too many significant figures on those numbers, but the general idea of "several thousand" should be more or less right.