[Lila Bramble]

Indeed, Gollum was a hobbit, shrivelled under the power of the ring, and living its everlasting life after so long in it's presence.

Pity is a thing not everyone can give, but Frodo has a kind heart and a determined soul. Gandalf is a great wizard with wisdom beyond any others, so Frodo chose wisely to consider his words.

Sam distrusted Gollum because his only concern was his master, so he paid no heed to any others saying.He decided that what ever need to protect his master, he would do so, even if teh chance of danger was but a small fraction of an atom.

Being a hobbit was nothing to do with the misturust or pity on Gollum, but still indeed it was a good question.