I think the best place to start would be to ask why they want to cut our heads off. Are we innocent? Do they hate us because we are free? Or is there a deeper root?
In 1953, Dr. Mohammad Mossadegh - Iran's democratically elected Prime Minister - was overthrown by a United States/CIA coup, arrested and tried as a traitor in military tribunal court.
This was clearly an unconstitutional act by the United States government, and is at the root of most of our problems with Iran to this day. After overthrowing Mossadegh, the US installed a puppet dictator - the Shah of Iran. The Islamic revolution of 1979, which overthrew the Shah was just Blowback - our own evil plot coming back to haunt us. This was the first of many such secret adventures by the CIA.
The CIA were the original funders and allies of both Saddam Hussein and Osama bin Laden. There is evidence that supports the idea that this radical form of Islam was even invented by the US CIA.
For more information on how the CIA operates, I urge you to watch The Secret Government. All of the CIA's budget and activities are completely secret - secret from everyone, including you, me as well as our representatives in Congress and the Senate. This is clearly unconstitutional.
Rather than dealing with symptoms (there are people that want to kill us), I think we would do better in the long run to deal with the root causes and work towards rectifying those. The first step towards this is a return to constitutional government, as Dr. Paul advocates.
All of us were ordinary compared to Cynthia Rose. If you set your mind free baby maybe you'll understand.