When I see politics in software updates or documentation, nothing happens because I'm not looking to use the software for political activism. Maybe I tell my adblocker to remove the messaging, and carry on with my task.
I can engage with politics in a social context, when political messaging isn't interrupting something else I'm doing; that's a better place for activism, IMHO.
I almost always see activists using the argument that if I don't like the messaging then I'm part of the problem. Somehow I doubt that, given I don't mind messaging at all, where it's appropriate.
Political opinions about how things should be don't automatically dictate the actions that should be taken in support of those opinions. I can be mad about a law or a court decision and still have the good sense to, for example, not throw red paint on a lawmaker or judge.
Some behaviors just aren't helpful, and neither being right nor being upset changes that.
Notepad++ is free, open source software for which there are dozens of alternative packages of equivalent quality. The entire cost of using this software and benefiting from the work of the developer, is having to scroll past or close a few political opinions.
If the reaction, if someone vehemently dislikes this sort of thing, is to tell that developer to "just shut up and make your software" rather than to stop using that software? Then I think that's possibly the most entitled and hypocritical position that I think it's possible to have.