Elrond Didn't Have the Strength to Stop Isildur The main reason that Elrond wouldn't have pushed Isildur was that he simply couldn't have brought himself to destroy the Ring. He knew that the Ring needed to be destroyed, but actually doing it would have been different.
Since the Istari knew Sauron was only banished, not dead, but Elrond didn't kill Isildur for walking away with the ring, they knew that his spirit could be vanquished destroying the one ring.
Remember that the power of the Elves — and they still possessed much power, more than mortal Men — did not make them immune to the Ring's corruption, but quite the opposite. The more powerful they were, the more they would be tempted to use the Ring, to master it with their power, and thus fall.
She's an Elf, So Has a Very Long Lifespan
The first and most obvious reason Galadriel gets to hang on to her Ring – Nenya, the Ring of Water – from beginning (i.e. its forging) to end (the destruction of the One Ring) is that she lives long enough to do so.
So, the first thing that happens is that Sauron himself and all the Nazgul now can “see” Frodo and they see where exactly where he is and that he has the Ring on. Tolkien is quite explicit, that in the the Sammath Naur, Sauron's Place of Power, no one could destroy The Ring deliberately.
As for Sam, his resistance likely has to do with his innate goodness and loyalty. His love for Frodo helped him to overcome the pull of the Ring and his inner pureness was never fully pierced by the Ring.
Because of their intense love of the earth, the Ring does not sense hobbits as a threat, which is why they were able to be overlooked and complete the quest.
She already feels an outcast after Gil-galad tried to send her back to the Undying Lands, and she fears that if she reveals what she has done, it will be the final nail in the coffin. Instead, when Elrond pulls her from the river Glanduin, and she races back inside to Celebrimbor's forge, she chooses to stay silent.
Sauron feared her
The author said that she was the “last remaining of the Great among the High Elves” in the Third Age, and consequently was the one person Sauron must have feared most among all his enemies in the War of the Ring.
In The Lord of the Rings, it is said that had Galadriel chosen to use her powers for evil instead of good, she would have been even more destructive and terrifying than Sauron himself. Galadriel was the greatest and most powerful of all Elves in Middle Earth in the Third Age.
Gwaihir physically cannot drop the One Ring into the fires himself. The Eagles of the Valar are huge, and that's an understatement. Not only would their flight above Mount Doom cause a stir in Sauron's forces, but there is no physical way for Gwaihir to drop the One Ring precisely into the Cracks of Doom.
Though someone could start out with good intentions, the Ring would eventually corrupt them. And that is why Gandalf can't touch it. He is afraid that if he did, it would corrupt him and make him just as bad as Sauron since Sauron put so much of himself and his evil into the One Ring.
The main difference is that, in the books, they were forged after the other Rings, not before. This means that the three Elven Rings weren't imbued with Sauron's malice, making them the most powerful among the Rings of Power — and the most coveted by the Dark Lord.
Elves have the ability to live forever thanks to their immortality. Elves like Elrond, who was over 6000 years old in The Lord of the Rings, are not hard to come by.
Though neither is someone you'd wish to annoy, Galadriel is generally considered more powerful than Elrond in Lord of the Rings. Not only is she older than her Rivendell counterpart, but Galadriel witnessed the light from Valinor's Two Trees, giving her a mystic quality.
Partially this was due to the unique situation of their ancestry: because of the complications of being descendants of marriages between mortals and immortals, Elrond and his brother Elros were given the choice of their own fates, to be mortal with humanity or immortal with the elves.
Sauron's deepest fear was that Aragorn would use the Ring against him. With its powers of domination, Aragorn could comfortably take over the entirety of Sauron's dark army. Though this would eventually corrupt Aragorn, it would allow him to destroy Sauron and take his place.
Elrond and Galadriel Go Back a Long Way
Being immortal, all the Elves who play a part in The Lord of the Rings have been around a while by the time the story starts. But even by elven standards, Galadriel is old. She was born in the Undying Lands when the Two Trees still lived.
Portrayal of Galadriel in The Rings of Power is divisive among the fandom. Her character is criticized for many different reasons, from her self-righteousness and abrasive personality, to her inability to detect the very evil she is hunting right under her nose.
Though Galadriel doesn't share her news, Elrond is suspicious and wanders out to find the genealogy scroll that leads him to figure out that Halbrand is Sauron. Unfortunately, he finds this news too late, arriving back at the workshop just as the elven rings (the rings of power) are being completed.
But the Elves were not so easily ensnared, and as soon as Sauron put on the One Ring they and Celebrimbor were aware of him, and realised they were betrayed. They hid their Rings from Sauron and did not use them.
The Dark Lord easily overpowers her, and after Galadriel rejects his proposal to join him, he traps her in illusions and leaves her to drown in the water.
No, it would have corrupted him. The thing with Hobbits is that they enjoy simplicity and don't seek out fame, power, riches, or glory. Aragorn may have ben able to resist the ring long enough to let Frodo go, but it would have corrupted him eventually.
While the previous 19 rings were crafted with the help of the Elves, the final ring, the 'One Ring to rule them all,' was crafted by Sauron alone; with the ability to dominate the other rings, the One Ring was made with some of Sauron's own power, in order to make it more powerful.
The Three were untouched by Sauron in their making and were made for preservation so they didn't negatively affect their bearers.