You write as if Fukushima was the only example. Take chernobyl: https://en.wikipedia.org/wiki/Chernobyl_disaster

You are correct that there were only few deaths but there was radiation damage, and if you sum that up then Fukushima was definitely noticable. https://en.wikipedia.org/wiki/Fukushima_nuclear_accident

Chernobyl happened, but it’s irrelevant to calculating risk for any other operational nuclear power reactor.

That RMBK was built by those crazy Russians who thought it was reasonable to not even bother with a containment vessel / building.