Why didn't Sam have a problem giving The Ring back to Frodo?

[Teleri]

I just don't think Sam ever really thought of the One Ring as more than a magic ring, regardless of how serious all the talk was about it

I like that idea. It fits in perfectly with Sams earlier character. Remember he almost forgets that Gollom wants the ring while they are traveling the marshes, only to be reminded when he witnesses Golloms debate with him self. remember this?

Sam had lain still, fascinated by the debate, but watching every move that Gollom made from under his half-closed eye-lids. To his simple mind ordinary hunger, the desire to eat hobbits, had seemed the cheif dangerin Gollom. He realized now that it was not so:Gollom was feeling the terrible call of the ring.

I think that Sam doesn't really understand anything about the ring until he is tempted, and then he is able to guess what Gollom might be feeling, which is why he showed pity on Gollom, and didn't hurt him with "cold steel".

I think that the ring's only way to get at Sam would be the love of his master, and given the Frodo's situation, Sam could hardly walk off , and leave...