I think you're missing key elements to the Fukushima story. It wasn't a surprise natural disaster, it was a predictable eventuality.
1. People tried to ring alarm bells about the building codes (and the reactor specifically) not being able to handle earthquakes of a size Fukushima was likely to experience. They were on deaf ears.
2. Japanese government admitted guilt for poor oversight and regulation.
3. Three executives were put on trail for negligence. There were found not guilty, but that's not the same as innocent.
Oh, for sure, Fukushima's story is not one where everyone did the right thing. It's one where there was negligence and carelessness, as well as a huge (and, yes, in some sense predictable) natural disaster ... and despite all that, the actual reactor-related consequences were not so very bad.
If the question were, say, "how much should we trust the Japanese government?" then Fukushima is not very encouraging. But if it's "how worried should we be about nuclear power?" it seems pretty encouraging to me. Lots of errors and negligence, huge natural disaster, and even so scarcely any lives lost and most of the harm done would have been the same without the nuclear power plant.
1. People tried to ring alarm bells about the building codes (and the reactor specifically) not being able to handle earthquakes of a size Fukushima was likely to experience. They were on deaf ears.
2. Japanese government admitted guilt for poor oversight and regulation.
3. Three executives were put on trail for negligence. There were found not guilty, but that's not the same as innocent.