Nah, no police closing threads, but when some threads start to go a little wayward, I'll usually step in and try to drop a little knowledge so it wouldn't degrade into "Aliens abducted Lacey Peterson because she knew that Princess Di and the Fedayeen had TWA 800 shot down because it had the director of the IDF onboard with a stash of Double-Eagle coins".
I'm pretty bad at making stuff up as you can see.