I guess a parallel would be the lynchings of black people that occuried in the last century or whatever (I know relatively little about US history) - so it appears that there were at one time in relatively recent history americans who were capable of barbarity. I believe there have also been cases of people executed in horrible ways in northern ireland by the IRA.
But in terms of TODAY, I think the answer is simply that WE ARE BETTER THAN THE HUMAN SCUM WHO WOULD KIDNAP AND EXECUTE WOMEN AND INNOCENT NON-COMBATANTS.
We are NOT barbarians.
We are a nation of LAWS.
We are civilized.
Now, if some actual terrorist (say someone who planned the 9/11 attacks) fell into the hands of a bnunch of New Yorkers, or for that matter any red-blooded americans, I believe he would not live long. He might not be beheaded, per se, but he would certainly be torn apart, beaten to death, or even lynched (see, there IS a correct time and place for lynchings
). I'd have no problem with that, since it would ultimately be a form of justice, and don't think such a killing would make any of us barbaric in any way.
just my 2 cents