But there are people in every country who would be capable of such acts. --Skogs

Agreed, I probably know some fellow Americans who would.

Well, suppose your whole family was killed, for example. And your friends. Would you do it then? --Shadow Nexus

I would defend my family, even by killing, but that's different than kidnapping an innocent civilian and murdering him in cold blood (in the name of a god, no less), and then publishing footage of it to terrorize people.