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.
In the context of forums, the political threads are generally /not interesting/[0]. Political threads often devolve; they bring nothing 'new' or 'fresh' to the table, and they lead absolutely no where. It's a fart-in-the-wind situation no matter what your position is. Leave that stuff on reddit where the rest of the farts-in-the-wind go to waste. It's like watching commentators on Fox News or CNN or <insert favorite cable TV show here>. They're a large waste of time and they're often geared towards re-enforcing your side, aka echo chamber.
Now, if a thread actually evolved into real measurable action, that might actually be interesting. But that's not what happens on these forums. There's probably very few of us that see some HN thread talking about something awful happening somewhere and they take direct action, such as petitioning their government, protesting, etc. It's probably happened once or twice, but most of the farts in those threads just hang around and stink up the place.
Please stop stinking up HN.