it's interesting to be re-thinking the role of science in public policy . and in many respects, the bush admin was anomalous in this regard, obviously tilting toward religion in the epistemic struggle. one wants one's policies to be informed by actual knowledge, i agree. however, of course science does not fix policies, and if it starts driving value-judgments it has of course renounced its own self-understanding. science can't tell you whether drawing stem cells from human embryos is bad, though often it seems like it is blandly telling you that it's ok. that's no scientific result.
and dangers lurk in the cult of science: leaving moral questions in the hands of empirical experts in some subject-matter, for example. pretending not to be making value judgments: offloading the real sources and implications of your values onto experts or facts. in many areas, the line betweeen empirical research and policy agendas is purposely obscured. global warming, for example: there no real line between facts and policies at all: everyone's screaming.
the habit of deferring to experts is, overall, not the most admirable or wise human tendency, and scientists are more or less as subject to fads and fits of uncritical unanimity as anyone else. what scientists tell you about human learning or mental health, for example, is going to be soaked in horseshit and contradicted completely in ten years. so make use of it with circumspection, and don't pretend you're not actually doing things to people because you think that's how they ought to be etc.
at any rate, just as the right tends to shuffle off their responsibility for actual moral decision-making on god, the left has the tendency to shuffle it off on "science," as though actual policies could be written by god or by "the facts." that the scientific community has the same politics as american adademics in general - that is, pure democratic party - is too often just disguised at the bottom of the supposedly objective study.
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