How the mighty do fall!

[Zigûr]

Originally Posted by Boromir88

Sauron is the prime example of this, but most of the great and mighty fall in LOTR, because they become motivated to bulldoze other free wills.

It's also worth remembering the desire of Melkor before even Eä was made:

he desired rather to subdue to his will both Elves and Men, envying the gifts with which Ilúvatar promised to endow them; and he wished himself to have subjects and servants, and to be called Lord, and to be a master over other wills.
(Ainulindalë)[Emphasis mine.]

Originally Posted by Boromir88

Gandalf does not seek control over anyone's free will. To do so, even if it would serve the "greater good" would be a supremely bad motive, and it's that motive which lead to the fall of the great and mighty. It makes you wonder, if push came to shove, and Gandalf was with Frodo in the Sammath Naur. Would he still reject "making" Frodo destroy the Ring? Would he bulldoze Frodo's will (although by this time you could say the Ring had already bulldozed Frodo's will) for the "greater good?"

I doubt anyone willing to "bulldoze" the will of another would be capable of even wishing harm upon the Ring at the Sammath Naur, for the greater good or otherwise.