[btrettel]

This Atlantic article cites a study which indicates that scientists don't lose credibility when advocating for political positions: https://www.theatlantic.com/science/archive/2017/02/when-sci...

Now, this is different from what you've claimed, which is about the effect on science itself rather than the credibility of scientists to the public. But I believe the study only showed short-term effects. In my view, long-term political advocacy is likely to make people view scientists differently than they view them now.