In retrospect it was my mistake, although given my initial state of knowledge I don't think I did anything wrong.
1) I thought there was a possibility that something could be done. As of now, I'll take the majority opinion's word that nothing can be done, even though I'm still not sure why this is true. The opinions from people I trust to assign confidences accurately is sufficient evidence for now. I might investigate myself later if I have time, although the fact that most people think nothing can be done indicates that perhaps it's not worth the time to research it.
2) I didn't mentally classify this under the heading "politics", but under "shit, lots of labs are shutting down for a potentially preventable reason, and many smart people (on this forum, too) think that science research is the single most cost-effective good, so maybe this is a very critical time to act. Maybe if I post, other people who know more than me will think about it from an effective altruism perspective and a useful discussion will spark." It seemed a pretty non-partisan issue, since all sides agree that it's bad. That was actually a mistake - I should have realized that anything tangentially related to politics is a political issue.
Despite some of the responses to the contrary, I'm actually still not convinced that this whole shutdown isn't a really, really bad thing...but I guess calculating the harm would be a difficult fermi estimate to pull off.
I'd say the mistake was speaking about disastrous consequences (as a certain fact), when in reality you had little information to back this up.
The proper approach in such situation would be asking: "I heard about X. Do you think it will significantly impact Y?" And then the debate would be about the estimated impacts of X (instead of about your overconfidence).
The political aspect just makes it worse, but I think speaking about disasters in situations where you have little information would be bad even in non-political areas.
For those who haven't heard, NIH and NSF are no longer processing grants, leading to many negative downstream effects.
I've been directing my attention elsewhere lately and don't have anything informative to say about this. However, my uninformed intuition is that people who care about effective altruism (research in general, infrastructure development, X-risk mitigation, life-extension...basically everything, actually) or have transhumanist leanings should be very concerned.
The consequences have already been pretty disastrous. To provide just one, immediate example, the article says that the Center for Disease Control and Prevention has shut down. I think that this is almost certain to directly cause a nontrivial number of deaths. Each additional day that this continues could have huge negative impact down the line, perhaps delaying some key future discoveries by years. This event *might* be a small window of opportunity to prevent a lot of harm very cheaply.
So the question is:
1) Can we do anything to remedy the situation?
2) If so, is it worth doing it? (Opportunity costs, etc)