There are weird people on SO who are both trolls and knowledgeable. There is one person who edits EVERY SINGLE question regarding a certain programming langua

There are weird people on SO who are both trolls and knowledgeable. There is one person who edits EVERY SINGLE question regarding a certain programming language. Then attempts to close every question as "already asked", even where it is somewhat questionable whether it had been asked already or not. He knows his stuff really well though so he ends up not getting banned. I do not get it.