The instance has had this policy for over 4 years. The sidebar reads:
The main focus of this instance is the natural sciences, and the scope encompasses all of the STEM fields.
Please keep politics to a minimum. When science is the focus, intersection with politics may be tolerated as long as the discussion is constructive and science remains the focus. As a general rule, political content posted directly to the instance’s local communities is discouraged and may be removed. You can of course engage in political discussions in non-local communities.
The goal when creating this instance was to a place to discuss about scientific discoveries, post pictures of nature, and have a set of communities for this while avoiding polarizing content. If someone wants to discuss politics they can click on 'All' and go right to it. The scope is explicitly anti-politics because I do not want to moderate a politically charged or polarizing environment, and I know that many people with interests like mine will also appreciate such a space existing because they see enough pictures of Donald Trump and polarizing discussions elsewhere.
y’all are a science community and science is being hunted down and destroyed systematically and your response is to try to become less political?
I do not disagree with you broadly, and that is to an extent why I use common sense and do not enforce the "no politics" rule religiously. There is quite a bit politics that gets through. Although I do prefer to offer users of this instance a politics free experience, if no one complains I usually let it go.
In this case: I have noticed posts in the front page that have nothing to do with science lately, and they came from this specific community. I then saw some US politics characters attached to articles that had nothing to do with science. I looked through the community and most of it is off-topic, so it makes more sense to lock the community.
I'm sorry this upsets you, I should have removed the community as soon as it was created, but I did not realize what it was.