I forgot to mention the move thread vs lock thread vs delete thread decision...how is that made?
It is entirely up to the individual staff member to make the decision. Judgement plays a large role when moderating an internet forum, and not everyone would make the same decision(s). For example, threads get moved if they are not in the appropriate section, e.g. if there is a thread about the next GTA game in the GTAV forum, then it will most likely get moved to GTA Series Chat. Well, at least that's what I would do. Someone else would lock it and simply refer to that forum.
Threads only get binned if they are so hopelessly derailed and spammed that nothing can be done about it. Oh, and of course if the topic creator posted gore, porn, or anything of that sort. Not to forget members who are posting the same thread multiple times, deliberately create new threads that are spam, et cetera.