I'm using "Americans" in the political sense, not each and every individual. Like when news-heads talk about "Iranians", they don't mean the guy selling food on the street but the people in charge. I don't agree that the red states are just 'leaches' (sic). They are not as important economically as the coasts but they do have manufacturing and play a role. Duterte was voted into power by the majority, so yes, he unfortunately represents the majority.
The UK and numerous other countries could create massive damage to the US in a war. Anyone who thinks otherwise has gotten far too comfortable. The biggest danger to world peace is the US and it's military first attitude and mentally unstable leader. Iran would be a massive undertaking for the US with no moral imperative to be there.