The notion seems to be the alternative to LNT is "radiation is not as bad at low doses as LNT". But there are many alternatives, all consistent with the evidence, and some would have the effect at low doses be worse.
Radiation is not a criminal defendant that requires proof beyond reasonable doubt to be regulated.
Expensively regulating something well below any detectable effect could have negative consequences regardless of whether or not it is a criminal defendant. For instance, nuclear power plants are very nearly carbon free, yet they're expensive in part because of the Linear No-Threshold model of radiation dose at very low doses. If they were cheaper and we were fully decarbonized in 1995, we could avoid the other more detectable effects of global warming.
The notion seems to be the alternative to LNT is "radiation is not as bad at low doses as LNT". But there are many alternatives, all consistent with the evidence, and some would have the effect at low doses be worse.
Radiation is not a criminal defendant that requires proof beyond reasonable doubt to be regulated.