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.
I do not think it is uncommon for someone to do this, then see the side they oppose win more in elections, public perception, etc then decide to engage more and that is "why is there political messaging literally everywhere".
Since we can't remove it, the next best alternative is to participate and advocate for responsible political engagement. I think until we have some shared understanding of what responsible political engagement is we will continue to have it everywhere.