What does this action/story mean?

I get dizzy trying to understand who is who, and what is what, in that region of the world.

Anybody help me?
How might this impact us anymore than how the instability of that region already has?  

One thought that came to mind while reading this, can you imagine if the Christians of this world, used this mind thought of revenge, against the forces that killed our Leader?  

Im thinking a link got left out.