I only skimmed the post, but the gist seems right:
SJ's generally stabilize and maintain the culture.
The specific traits we might label as "SJ" (such as "marriage between a man and woman") are not inherent SJ, they would only be the "given" for SJ thought because that's what the standards were.
At some point, if other types of marriages become openly accepted and the new standard, then SJs would seemingly support THAT standard instead. (ESJs are much more inclined to let the standards shift, too. It's your ISJ's who are most liable to cling fiercely to the past way of doing things or thinking of things.)
So you have to be very careful about what gets assigned to "SJ beliefs." Much of the actual content of the beliefs is inconsequential, it's the fact that the beliefs (whatever they are) were the given standard / accepted truth that has a bearing on things.
Again, Keirsey's SJs derive their reality from the way things seem to be and what they've experienced. It becomes the model by which other things are judged.
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