Look at all the cancer from 9/11 and that was just fine particles in the air.
Now imagine radioactive fine particles with half-life of decades.
Sure, the death isn't instantaneous. But the suffering and early death will be massive. After the US nuked Japan (twice) the real damage was to those left living for the short time afterwards and all the radioactivity an slow death.
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Look at all the cancer from 9/11 and that was just fine particles in the air.
Now imagine radioactive fine particles with half-life of decades.
Sure, the death isn't instantaneous. But the suffering and early death will be massive. After the US nuked Japan (twice) the real damage was to those left living for the short time afterwards and all the radioactivity an slow death.