How did those technical experts do in places like Vietnam, Afghanistan, and Iraq? How did they do in the past in negotiating with Iran? The US negotiators are not the problem. Iran is the problem. How can you negotiate with people whose objective it is to destroy Israel and US and go down with the ship if necessary? The only thing you can do is keep applying the pressure until they crack. The primary reason that Trump is president are the decades long failures of the establishment guided by "experts" like Kissinger and Bolton.