system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Why do Gandalf and Galadriel still wear Rings of Power?

Disclaimer: I’ve never ready the books and am basing this question on the movies. 

Why do Galadriel and Gandalf still wear rings of power? They know Sauron created them and the One ring to rule them. They’ve seen what became of the ring wraiths. Why do they still wear their rings?
gpt
The Three Elven Rings were the ones that were never touched by Sauron - they were made by Celebrimbor alone, and were not tainted by Sauron, who was directly involved in crafting the other 16 great rings (which eventually became the 7 given to dwarves and the 9 to men).  Still, even though he never touched them, he would still have been able to dominate their wielders, so while he was in power they were kept hidden and unused.  But even so, these three alone were the purest magic rings in the world - their owners wouldn't fall to corruption like the Ringwraiths, or like Gollum.

After Sauron was defeated the first time, the Three Rings were used to maintain the Elven lands that they protected - Rivendell, Lothlorien, and Mithlond (the Grey Havens where the ships heading West set out from).  It's thanks to their power that these regions stayed mostly pure and beautiful - the Three Rings were able to do their intended job without Sauron finding out, though they were still used with secrecy.  

And when Gandalf came out of the West to come help out in Middle-Earth, Cirdan, the lord of the havens, basically said "Hey man, you'll need this ring more than me" and passed his on to Gandalf - Narya, the Ring of Fire.  It's believed that the power of this Ring helped Gandalf in his task, which was to inspire the world of Men to fight against the darkness - he was a flame that kindled the fire in Men's hearts.