pig, I don't think any poster changes another's views. What does happen, I would hope, is that a particularly well-thought-out post will open a reader's mind to a way of thinking s/he might not have considered. There probably is not much persuasion but, so long as the tone is right, there should be an increase in tolerance of those who disagree.
The other thing is, after a while here I have sort of isolated what basic premises certain people proceed from. People tend not to change premises because no one here is a blank slate. That's why there is very little persuasion going on. But there might be more understanding.
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