I feel the blanket ban on a general topic is a bit heavy handed, especially when it specifically relates to games as an artistic medium.
That said, I don't particularly feel that our narrow sub-sampling of humanity here is a good place for political, cultural, or social discussion. It will either result in flame wars or echo chambers.
I wasn't really aware that the issue was enough of a problem to need a rule. Probably because I don't pay much attention to the general-discussion - due to the above reason.