Well, the problem never was the existence of radiation, it was the amount of exposure over a timeframe.
Our body is constantly repairing DNA due to a variety of damage it receives from things like cell replication, regular metabolism of stored energy, and radiation damage.
We're designed to cope with reasonable levels of environmental radiation.
Sure, it'd be better if Chernobyl didn't blow up, but we're hardly suffering from it except for perception. Then there's the fact that we'd never make that same mistake again.
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