American. Not Americans.
Don't know how tongue in cheek your post was but the West needs to make it clear we (ok... the USA) will not tolerate the killing of Christians... fuck it, we will not tolerate the killing of non-muslims. They are fighting a war on religion, fight the religion with the war.
James Foley is not the first American to be murdered. Not by a long shot.
I should rephrase... yes, when Christians are being killed something needs to be done, swiftly, decisively, and without remorse.
And as far as I am concerned, American, Canadian, UK/Ireland/Scotland, are all essentially one people. I would be as upset if it was an Irish Catholic getting his head lopped off.