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Just got done telling my students about Brahe and Copernicus and Galileo. Brahe had a fairly large conflict of interest. Copernicus, Galileo ran into a certain dollop of hostility--nothing compared to what the author in the OP ran into, I'm sure. (Things were so much better then.)
One difference now is that scientists seem (to me, although I suspect I'm probably wrong) to have acquired a more prominent place in the decision-making process.
Science is often like religion: It's a bad thing to mix either into politics. Politics, policy-making, requires both a measure of flexibility and a measure of determinism.
Religion often lacks the necessary flexibility. It deals with absolutes of the sort that humans rarely can live up to.
Science lacks the necessary determinism. You need to have confidence that your findings are going to be long-term stable, you need to be confident that your findings aren't going to be overturned, that your findings don't have conflicts of interest.
When you're cited as saying we need X amount of water, that all cholesterol is bad for you, that this drug is safe or that this is the real cause of something bad *then* it turns out that the amount of water was a guess, not all cholesterol is bad for you, that many "safe" drugs aren't and that scientific findings are often either subject to being revised in the light of new data, it undermines science. Scientists can advocate, and often they'll advocate both sides of an issue; but they can't suppose to set themselves up as the final arbiters because that way lies the dissolution of any bond of trust between the public and scientists.
The problem is that science is fallible. It will always have conflicts of interest, bad results making for bad theory, incomplete knowledge. It gets better, we hope, but there's usually a margin of error. When advocating, pushing for a policy or law, scientists emphasize their rigor and want politicians and the public to simply say, "Yes, master." When they err, as is human, they then say, "Ah, well, that's the way it goes!" Humility at the beginning would go a long way.
When, in a democracy, the claim is that politicians must listen to scientists in imposing decisions on the majority because, well, the scientists are so much smarter, you've screwed the pooch. If that's the case, there should simply be experts to decide everything for us because we the demos are so incompetent; then we can dispense with the frivolity that democracy would have become and have a pure oligarchy.
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