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I agree and think we could benefit greatly from scientists helping make decisions. But they would be terrible at campaigning, raising money, etc.. Good political leaders surround themselves with good advisers, which include scientists.
It's a different skill, anyway. Look at something like climate change. A climate scientist can tell you, yeah, the planet is getting warmer because of human activity, and there are a lot of bad consequences to that. OK. So what do we do about it? Reduce carbon emissions. How? Maybe an economist will then tell you that the best way is to change incentives by taxing carbon. Now there are majorities in both houses of Congress that are committed to never raising any taxes so what do you do? Oil companies will fund an ad campaign against you and think tanks to produce studies, which then get repeated in opeds, saying that your tax is going to destroy the economy. Leftist groups will say that your tax is regressive and will hurt the poor or that you're a sellout who is going in for half measures (why not ban emissions?), and they oppose you. Etc. A scientist, no matter how good, is not necessarily going to be able to figure out how to navigate through all that to get any helpful policy done. And that's just one issue, on which almost all scientists agree--that is, a relatively easy one.