An earthquake isn't a black swan event, correct.

An earthquake of that magnitude, creating a Tsunami of that strength, striking in just the wrong place .. is very much a black swan event.

https://www.youtube.com/watch?v=ilFEKSZQv5o

By your 'logic' no dam can be built as they all stand a chance of a direct hit from a meteorite.

Risk-wise the Fukushima nuclear disaster cause less direct and indirect death than many accidents and natural disasers .. including deaths from, say, fertilizer depot explosions, oil rig accidents, etc.