Just wondering??

[Shadoww]

Keep in mind that the forum threads you read on rendered dynamically on-demand from a number of database tables. So all posts by a banned user will reflect his or her banned status, despite likely being unrelated to the ban.

More reason to remove posts or tell what happened I think. There a so many banned posts that is impossible to find out by reading them all.
Is only my opinion and suggestion. I repeat: I do not want to question a ban or policy.