Quote Originally Posted by DrWho2010 View Post
They can't tell you what you did or said because of privacy reasons. They don't want people retaliating and harassing the person who reported them if they manage to figure it out.
From what I've experienced, it's standard for MMOs to explain what you actually did wrong when you commit an offense, because they know they can just punish you again if you try to seek retaliation.

This really is a case of SE being overly protective to a fault.