Perhaps the issue is not that you kill a thread, but that you post on a thread that has basically been killed already. I haven't researched your threads to see, just speculating. I find that if I post on an interesting ongoing thread, and my post is say, unappreciated, it just gets ignored, it doesn't kill the thread. If you just log on every few days, you may be hitting threads that have already run their cycle before you got there.