The Tepco Example: Convincing Enough?

Just because we don't hear much in mainstream media land about the ongoing crisis in Fukushima, Japan doesn't mean all is well at the decimated nuclear power plant. Two years since the Fukushima Daiichi triple meltdown, the crisis continues to wreak havoc on the country and threatens to pollute entire oceans with radioactive wastewater.
Was it simply an earthquake and tsunami that caused this global problem? Or is it a result of poor, selfish planning by people?