We have to keep in context that some 25,000 were killed by tsunami and noone yet is killed by radiation.
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What context are you referring to? The tsunami death toll is unrelated to workers being told that they must defeat safety equipment in order to keep their jobs.
How much worse would it be if there was nobody to work in the plants and towards stabilizing the reactors?
That’s what we are talking about.
Perhaps they should pull a union and strike for higher wages and better working conditions while the core was overheating. /s