Christopher-
In the US, for example, the press is not supposed to show grossly mutilated bodies. Also, they are not allowed to release the names of underage rape victims. Why is that? Because it endangers and upsets people.
http://en.wikipedia.org/wiki/Abu_Ghraib_prisoner_abuse
Does this information endanger and upset people? Yes, it endangers the soldiers who committed abuse and their superiors who tolerated or ordered it, and it upsets those who strongly believe that US troops don't commit such acts of brutality.
Should it be removed? Of course not. It is education where it matters. It is education that can prevent suffering. Similar information, where it applies, should be published about the Chinese government, the Chinese troops, on the Chinese Wikipedia.
You may call that "activism", and you do have a point. If you know anything about the history of encyclopedias, you know that they were born out of enlightenment ideals (and not very NPOV!). People like Diderot deliberately tried to "upset" the status quo in many ways.
We are not like the original encyclopedias in that we don't deliberately promote specific agendas (at least we try not to). But certainly it would make us a parody of an encyclopedia if we went out of our way to prevent information from being distributed that could lead to social change -- it would be the exact opposite of what the original encyclopedists wanted.
Regards,
Erik