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There are a few reasons. 1) if folks could change everything they said through a thread, they could make what was discussed look very different than it actually happened which could be both embarrassing and mistreatment of the other posters. 2) Once you write it, it is no longer yours, it is part of the information on the site. We use the forum to discuss, learn, joke, laugh etc.... but once you post, you don't own the posts. The site owns them. there are more reasons, but they are all shades of these two.
continuity, control of data.
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We don't see things as they are, we see them as we are
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