It is expensive because we choose to make it expensive. It is regulation pushing safety levels far beyond other industries, and far beyond science (radiation is far less harmful than regulatory models suggest)
You do NOT get to constantly taut the low mortality rates of nuclear AND call for less regulation at the same time.
But even from a very matter of fact point of view, I'd rather have 1000 people die every year for 20 years, than have 20.000 people die on a single bad day/week. The economic and social impact is far, far bigger when it can't be "spread out" over multiple years.
Yes, you do. Especially given the outstanding new levels of nuclear tech and safety. The economic and social impacts are hugely positive. You will see this in the next decade as new facilities come online.