There are a couple of reasons for this. Firstly, I want this account to be a safe place for everyone, despite any “category” you belong to. The best way to do so, in my opinion, is to avoid topics like this. Secondly, I do not wish to be scrutinised by people I don’t even know. Negative feedback from people online has contributed to my depression, and I don’t want to risk that happening again, with something as obviously controversial as politics. I want this account to be a safe place for everyone, despite any “category” they belong to or specific opinion they may have.
There are some exceptions, although they are few. For example, I am happy to say I support the LGBTQ+ community any day, but that is pretty much where I draw my political line. (at least for now)