And "it's the only language they seem to understand" is nonsequitur. Please explain how it justifies the murder of people who were categorically not involved with the murder of that pilot. They were in prison. They had no involvement.
Did bombing Hiroshima and Nagasaki not save an estimated one million lives? Not saying it's right, or a nice thing to do but sometimes you have to do what's necessary to win.
I'm really worried that Jordan will now cave into the Islamic State, further strengthening them and will ultimately result in them controlling even more territory in Jordan, which of course is what they want.