Why are you here on a chat board and not suiting up to save him?
Obviously the US was not intimidated. If we were, we would have handed over the ransom requests. The US has said to release him and turn him over. They have not. And the US is not required to go in and extract his ass.
Use diplomatic channels to get the release of American civilians abroad who are kidnapped? Yes. Send in the Rangers to get a kidnapped American civilian? No.
'Negotiate' with terrorists? Never. These people don't have "diplomatic channels", you are giving them more credibility than they have. These people are nothing but maggots thriving on the cesspools of humanity.