Whether self-radicalized on the internet or trained in foreign countries by extremists. much of the terror directed at us is a result of trying to be the world's policeman to make the world safe for exploitation by the global elite.
When you come in and depose a duly elected and well liked leader, like the CIA did in Iran, and replace him with a harsh despot or when you let corporations rape a country's resources or when you kill innocent women and children as "collateral damage" with drones, you engender extreme hatred and play into the hands of extremist elements and there are likely to be consequences. There are some very good reasons why we are so disliked around the world - and the Oliver Stone series "The Untold Story of the United States" is a must see for anyone who does not understand that.
Obama is about as far from a Ron Paul in every way as you can get. He is very much an interventionist tool the same as has been the case with just about every president in my lifetime - with possibly Eisenhower and Kennedy being less controlled by the global elite.