What is the meaning of this?

8 foreign medics executed by Taliban.

Source:http://sg.news.yahoo.com/afp/20100807/tap-afghanistan-unrest-eea7cf4.html

I really don't understand why are the Taliban so cruel and why the world is turning out so. They use violence to intimidate and cause mayhem all over the world. Everyone knows that medics are people who help save lives and tend to the injured. The Taliban killed them, accusing them of being Christian missionaries along with 2 innocent Afghanistan.

It makes no particular sense as to why these people are innocently killed. Even though they may have been Christian missionaries but this is a free world and everyone has a choice to do what he wants and they are not offending any particular law that deserves death with their bodies riddled with bullets.

Are we really a world of civilized people? Is it in our human blood to be violent and kill if not educated? What exactly can we do to prevent these murders of innocent people? This act is clearly an act of barbarians. I believe that there are many views on this issue and I hope that we can discuss about this on the comment board.