This is one of those things that SXSW doesn't want to burn a lot of calories on trying to wrangle. SXSW is still mostly focussed on music and movies. Nerds fighting over video game politics are not in the wheelhouse.
Put another way, you go to SXSW to have a great time. You do not go there because you want to fight over ideology. Nobody from the alt-rock music scene is making angry Tweets because the alt-country guys have a venue, nor vice versa. As far as SXSW is concerned, both factions are music fans who might find common ground, but otherwise are not interested in open warfare.
Activists on games, they're not so chill. (They'll become chill, after gaming has passed through the "Fonzie Barrier," where rebellion and fear mellow and become folksy humor.)
TL;DR: SXSW isn't interested in burning resources on your gay slapfight over who's right on the Internet.