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.
As problematic as the assertion "by definition" is aside, it should be noted that endlessly commenting about politics on internet forums effectively changes nothing.
I've been kettled by mounted officers and hit by high pressure hoses on cold evenings, something that also rarely effects change .. but that's a least a fun night out with people and better than wasting bits on the intertubes.