I'm dealing with a sample size of maybe a half dozen but I don't think I've ever used a forum where you could delete your account.
All forum software has this capability. It's trivial to implement and obviously necessary in some cases. Forum owners and administrators refuse requests to delete accounts because the act of posting provides them with content which they now own, and in most cases, hope to derive revenue from. The precedent that users' posts are actually owned by the users and not the forum owner is the problem and the reason such requests are generally ignored. If you're really motivated about it, I'll write you a pearl script to edit all of your posts to include spam and racial epithets. Your account will be deleted in no time.
Edited, Dec 10th 2013 9:09am by Smasharoo
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Disclaimer:
To make a long story short, I don't take any responsibility for anything I post here. It's not news, it's not truth, it's not serious. It's parody. It's satire. It's bitter. It's angsty. Your mother's a *****. You like to jack off dogs. That's right, you heard me. You like to grab that dog by the bone and rub it like a ski pole. Your dad? Gay. Your priest? Straight. **** off and let me post. It's not true, it's all in good fun. Now go away.