The USA doesn't act alone.

British prime minister (click here) tells the UN general assembly the world must learn the mistake of past military ventures in Iraq, but 'must not be frozen with fear'. Cameron says there is a place for Iran in the fight against Isis, but in the case of Syria's leader Bashar al-Assad, 'my enemy's enemy is not my friend – it is another enemy'. 

The political spectrum in the USA is very limited. It only seeks to the President regardless of the truth and it's facts.