If political or economic forecasting is your job, and you get a forecast badly wrong, you should face professional consequences. If that approach turns out to be unworkable because no one can make reliably correct forecasts, then such forecasting should not be a job people do.
If these folks had a huge portfolio of correct predictions, you are right that it would be unfair to single out missed ones. But this is more like a situation where there's only a potential rain event every two years. And there are additional ways political forecasting is harmful
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