Meh, just because you don't like it doesn't mean it shouldn't appear as an active topic. If no one viewed or participated the topic, it would no longer be active would it.
I'm sure you can live with seeing a thread on an active topics page occasionally - you don't have to read it. Its not that much of an inconvenience is it? There are plenty of threads in the active topics that I don't read, but I ignore them and get on with my life - appreciating that some people do use them (such as threads for individual english teams) and it's probably more helpful for them to see it in active topics than it is (very slightly) annoying for me to skip over when I see it.