Tabacco's talking about the thread closed in Adventure, which probably saved someone from completely hanging themselves.
Without putting words in his mouth, I think the other one was just closed BECAUSE it had run its course, and as you said, already started to move into the typical banter that happens everywhere. Closing just saves the potential hassle of some yahoo coming back in just to stir up trouble and misunderstandings again. Since it wasn't closed BEFORE it had served its purpose, no one should really be upset that it was closed at all.
As a final note from me on the subject, I really don't think it's THAT hard to figure out why a thread is closed. The fact is, a single thread can take on a life of its own (so to speak), and at some point it may become beneficial to snuff it out. Even if the
topic is resumed in another, the break still makes it clear that
behaviour has gotten out of control. Usually people get the message, even if they occasionally squawk about the measures.
So, um... yeah. Give and take. We'll try to communicate clearly, and you guys cut us enough slack to realize we aren't made of patience and free time.