If it's your thread, then yes, you do have the authority to ask. But when it isn't yours and you've become bored with it because people are doing what they always do then you do not have the authority to tell anyone to close the thread. That, as I have said, is up to Kagom if he thinks the thread has served it's full purpose, or the members of staff who might think the thread has also served its purpose or gone off-topic too much.

If, say, you were a manager somewhere and a trainee came up to you and ordered you to make a cup of tea for them, maybe even heat up and butter a couple of crumpets or scones, you wouldn't say yes let alone listen to them as they don't have the authority to do that. If, however, the owner or administrators of the company asked you to do the same thing for them you'd do it instantly.

You have authority as a junior member to do some things, just as some have that of a member and others have it of a senior member. If you don't have the respect of other members, then there's no point in having any authority. Asking members who have been here longer than you, and have a lot more respect than you to close a thread that isn't even yours won't help you get any respect. Nor will your request be carried out.

It's all a question of authority. In this case you don't have it, so don't try and use it. You may be able to produce works of art with words but, as you have shown us, you can be arrogant as well.

And so what if it was predictable? If some things in life weren't predictable then how on earth would anyone have a sense of security? There are people that live their lives on predictable actions, and they are doing just fine. You don't necessarily need to point out every little predictable thing.