I think one perspective problem that has never been adequately addressed is the difference between long periods of extremely low level radiation, and a sudden dose all at once (as in a nuclear bomb). We know linear-no-threshhold is wrong. If it were right, none of us would live under prolonged exposure to sunlight - our sunburns would be chronic injuries rather than things that the body heals over time. Yet it is what we use to quantify radiation damage anyway, because it is ludicrously conservative. People who have to cover their butts from lawsuits know that if they use it as a standard, there is no possible way someone within the "safety limit" could develop a problem.
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