I understand your frustration because I used to do this task as well, but a five paragraph post to request something that we had no idea you wanted seems a bit much. You would run a lot less risk of offending someone by just saying something like, "Hey everyone, if you continue writing on a thread that's not on my list anymore, could you let me know? Thanks!" rather than berating and accusing us.

I don't recall anyone saying that that thread was finished anyway, but I will do my best to let you know if something is continued that is no longer on your list.