Glorfindel, you appear to be in COMPLETE ignorance of the basic tenets of this story.
It does not matter what the rings were created for. Sauron CORRUPTED THEIR PURPOSE, and with the One Ring doomed those who used them to corruption.
Only the spiritual Elves could resist, and the hardy Dwarves got away with only a lust for gold.
But MAN had no such defence, and any man attempting to use a Ring was doomed to corruption, and that is exactly what happened! That's what the Nazguls ARE! THAT is what Aragorn would become should he try to use the Ring! That corruptive influence did NOT stop when Sauron lost the Ring; it exists as long as the One Ring does.
But not even the Elves can resist the power of the One Ring- in that they would attempt to use it's ultimate power for good and in doing so BECOME evil.
The One Ring does not work like the others, it is entirely different
So in future, before you start mouthoing off so ignorantly, check your VERY BASIC FACTS first.
I said the Nazgul's rings made their way back after the incident at the Ford, not after the death of the Witch-King.
And if you knew what you were talking about you would also know that all the rings try to make their way back to ther masters. The One Ring was prevented from doing so for a considerable period of time; clearly the rings of the Ringwraiths were not.
Incidentally, your idiocy in thinking that Eowyn as a woman there avoids the 'man' thing is extreme. The term 'man' was meant as in 'mankind' in that instance.
Questions are appreciated here but please check your facts before you mock others.