Trump's popularity is based on him openly despising politicians and the joy his voters got in flipping up a middle finger to the political elite. His issue was that he thought he was the message himself and that he had the same cult following mandate that Obama did and it just isn't true as significant portion of Republicans were just not going to blindly back Trump candidates who had massive issues just because he backed them. Trump works as an individual candidate as long as he is the lesser of two evils, he doesn't work as an advocate because he has to make it about himself.
The reason for going after Iran is tied to Iranian activities over the last 47 years that have resulted in the deaths of thousands of Americans as well as hundreds of thousands of people across the Middle East. If Iran is neutered to the point where its proxies cannot cause issues beyond their borders, then I'm all for it.
Your issues are your Prime Minister's issues, not the American President's concerns. If you want to become the 51st state then you can put in an application and if accepted, then it becomes an American issue.