The point that really came home to me from that post is that --- to use the author's terminology --- an outgroup is a tribe which is in conflict with my tribe. In other words, a tribe whose activities is irrelevant to me is not my outgroup. So tolerance towards it is easy and therefore worthless.
This is something I've never seen stated outright before, and it seems totally true to me.
(For the avoidance of doubt, my comment that what you said applies to lots of things on SSC wasn't intended as any sort of criticism -- I wasn't saying "boo, you failed to describe the article in a way that distinguishes it from the others" but "yay, SSC has a lot of really good articles".)
This is something I've never seen stated outright before, and it seems totally true to me.