We did not and have not gone after Iran or Pakistan, which were the equivalent of Haiphong Harbor in Vietnam, the lifeline of support for killing and injuring our forces on the battlefield. I think that's a good analogy as well.
If you remember the history, the Haiphong Harbor was off limits to bombing out of fear of Russian sailors being killed and creating the possibility of a wider war with the potential for a nuclear conflict. I'm not going to differ with that in total. It does seem to me there were alternatives. In the first months of his administration Nixon should have made an ultimatum to the North, you pull back across the DMZ and never venture south again, or we give you ten days warning and bomb Hanoi until there isn't a tooth-pick size shred of anything left. We then give you two days to comply, and start the process over with your next largest city. We will continue until you get the message.
The same old thinking about Nam I suspect plays into what Bush and Obama have chosen not to do with Iran or Pakistan in the last ten years. I'm not going to disagree with you here either, because I think there's good reason to believe what you do. None the less, you can't tell me there wasn't a way to get the message through to Iran. I don't think we put enough effort into it frankly. I have had some rather powerful negative thoughts about Bush concerning this. Syria is another sore topic, and Saudi Arabia deserves some attention on this problem too. That being said, there are pragmatic reasons for not taking Saudi Arabia to task as vehemently as we would Iran and Syria. Saudi Arabia for all it's negatives, still does our bidding in the Middle East. That's not to say it's Wahhabi sect isn't a real pain in the ass though. When this leadership is gone, folks will begin to understand more clearly how much worse Saudi Arabia could have been all along. IMO
As for Pakistan, the world has benefitted from it being misdirected away from Nuclear conflict with India. As a nuclear state, we needed to play a reasoned game there. I think we walked the fine line about as well as we could have. We have used drones in country. We took Lauden out from in country. What really told me a lot, was that the Pakistani people weren't all that bothered by it. Our media were camped out around the compound for a few weeks, and retaliation was not taken. Frankly, that amazed me.