Yeah. In hindsight a nuclear power plant in a country with frequent earthquakes has to be hardened against earthquakes. Earthquakes can cause tsunamis so any plant on the coast has to be ready to handle tsunamis. Tsunamis come a while after earthquakes, so they have to be prepared for the double whammy of an earthquake with a tsunami just a short time later. And, to be fair, it's not like they hadn't thought of those things at all. It's just that they made some design mistakes that seem obvious in hindsight.
But, it's still significantly better than power plants that just melt down completely on their own due to incompetent design and incompetent operations, with no triggering natural disaster.