Why do so many new people disappear without a trace? In many cases, it doesn't seem to me that they did anything wrong. Is not knowing physics a cause for an immediate ban? One example is the thread started by Bigpapi777. He asked some questions (about cause and effect) that I was trying to answer, and the thread got locked while I was writing a long reply to him (yesterday or the day before). Today I figured I might as well finish it and PM it to him, or ask an admin to add it to the locked thread, but he was gone and so was the thread! Locking the thread didn't make much sense to me, and deleting it made even less sense. Especially after deleting his last post in the thread and locking it. When you deleted the thread, you deleted my posts too, and that's pretty annoying. Why should anyone bother replying to anything if something someone else says can get the whole thread deleted?