You have the right to your content and can download it any time from your user profile page. But you don’t have the right to ruin the conversation for everyone else by forcefully removing your content and rendering the conversations unintelligible for all future readers.
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If you’re a new user with 2 posts or less, you can auto-delete your account at any time.
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If you don’t have too many posts, you can ask the staff for deletion and they can probably oblige you. This should be a call made by the staff.
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If you have a lot of posts, you can ask the staff for anonymization. This removes all your identifying information (username, full name, etc) but leaves the posts intact.
I guess the implied request here is to allow users to anonymize themselves at will. I could support that as a site setting…