What if Jesus came to show who God actually is?

You live in a country where the police actually does something on these cases?

No necessarily. Sauron was taken by surprise, so he may have countermeasures at his disposal if there would be other encounters.

Even if not, it makes the refusal of Aragorn to use them again even more noble, which is the literary goal of their existence.

Yes! The answer is “you can’t, and that’s the point.”