[HerenIstarion]

May I confess I'm immensely enjoying this little skirmish of sorts?

I would say that Turin does exactly that

Well, of all things else, I thought of Turin as argument in my favour. Indeed, what good did his pride brought him himself? He ended up murderer and suicide, committer of incest. Noldor likewise. There is no telling what may have happened if Noldor restrained from rush action. For one thing, there would have been no Kinslaying. What good is following their bad action, is result of Eru's 'bringing good out of evil' principle, but for the doers there is woe and misery. Turin dies, and Noldor are relieved only after total humiliation, when they are almost swept off ME shores into the sea

By difference in form of the thing percieved. My feeling is that the Elves would seek constantly renewed experience of what they already know, whereas men would seek experience of new things. This is how I understand the difference of human & Elvish psychology. Both races could tell whether they were simply looking at the same tree with 'renewed' vision, or looking with the 'same old' vision at a new tree.

No telling before we get there, but it seems to me that it is the same thing, whether one looks at old thing with new eyes or new thing with old eyes. Can not be told apart, somehow + and - signs are exclusive.

But surely, the result of any loving deed of Eru must be 'perfect'

Truly so. But the priority is Love and Good of the Children, the perfection is merely consequence of [the logical conclusion that] the deed proceeding from the perfect being can not be imperfect, or else the being doing the deed is not perfect in the first place.

but they couldn't seperate the concept 'jet' from the concept 'fighter'.

Now that's mere speculation. The mere ability of separating Great Ring from their own Elven Rings proves the opposite. The concept is brought in by Sauron. It may be argued that it is actualization if not Morgoth's, than of his greatest minion's themes. Once it is known that Annatar is indeed Sauron, in case the concept you propose be true, than there would have been for elves two ways only - to go on using the rings and be evil, or reject and destroy them on the spot. Ture, Sauron haven't seen or touched Elven Rings, but the idea of applying power just so proceeds from him.

What really happens, is that Elves show quite a good ability of distinction you reserve for Men only, shift the gears a bit and use their rings with a proviso (unless the Ring is found)