I think maybe never question the moderator, If it gets closed then there must be a valid reason. The moderators only close threads that aren't conforming to the forum rules and expectations (unless there's power abuse, but I've never heard about power abuse on the forums). If you would like to know why a thread had been deleted, then you'd have to ask the specific moderator, however, you don't really know who that is - which is another possible reason why not to mention it, as it could start a negative relationship between the original poster and the specific moderator (if the original poster is too immature to handle the forum rules).

I don't think moderators close these sorts of threads unless they have reference to the original thread thus counteracting the purpose of deleting it/removing it in the first place.

Note: Maybe Your thread had reference to a thread that was deleted/closed, therefore it's only sparking and negating the effects of that action, and therefore should be closed.