THE RING and corruption

[Tar-Palantir]

He actually mentions that Sam's treatment and attitude was a factor in Smeagol/Gollum's decision.
So, I don't see how one can argue with the author.

Pardon my ignorance here, but you'll need to provide a source or reference for that. I've never read anything that has specifically said it is Sam's fault Gollum didn't repent. I find this a ludicrous notion.

The bigger picture of course is that Gollum's integral part in the destruction of the Ring WAS his repentance for deeds done. It was quite obviously an unwilling sacrifice. All of Sam's sacrifices were quite willing as we know. The difference was in Gollum's 'desire' for the Ring - which would never have left in my opinion. That is why Frodo was his 'master' - Gollum revered him in a twisted way.

Elrond:

The very desire of it corrupts the heart.

Corrupt: Evil, debased, depraved.