Policy involves judgement calls regarding acceptable risk for humans, among other things. That is not the domain of science.
Whenever we hear Dems act like people deny science when the people are actually opposing policy, we know some kind of bullshit is going on...and that perhaps their policy is not as strong as it should be, because they cannot justify their policy on its own merit, and they feel compelled to pretend their policy is dictated by science.
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