So you seriously think that if Russian and American diplomats shook hands Assad/Gadaffi would step down and the rebels stop fighting ?
If you actually believe that diplomacy shouldn't be explored when opportunities present themselves, you're utterly insane.
Russia and Syria are allies. Getting them to talk is a non-issue. Iran is the same. It's in their interests to end the conflict. The FSA do have a heirarchy. The FSA was backed by the United States. If you actually read what was being proposed it included everyone, starting with a ceasefire. Then talks, then Assad moving away from power. Surely exploring it is better than a rejection, you cannot be serious with your stance.
And again, Saif Gaddafi's proposal was sent relatively early on when the troubles started in Libya. Something that should have been explored.
Sure, but that doesn't help with the situation at hand. Right now, sadly, the best way to go seems to be bombing. Ground invasion is pretty much out of question and without US air support Iraq Army and SDF would be in much worse position. It's a very shitty situation and of course it would be best that US would minimize the casualties as much as they can, but "seeking resolution to the conflict" against ISIS that doesn't involve war is pretty much out of the question.
There isn't any room for negotiating with ISIS. My response is more to do with general US foreign policy and Western intervention.