Although Muslims can’t quite agree on precisely who Mahdi is, they mostly agree that he is coming soon. Their traditions indicate that he will appear to administer justice at an historical moment of intense chaos and bloodshed. Thus, many Muslims (mostly Sunni) believe that if they promote chaos and bloodshed, they are actually preparing the earth for his long awaited arrival.
This has everything to do with the escalating clashes we are seeing in the Middle East and especially with the increasingly barbaric and torturous methods The (primarily Sunni) Islamic State of Iraq and the Levant army is using to dispose of their Shiite brethren and every variety of infidel.
So, to clear things up, ISIL is just putting a little welcome mat out for their Mahdi. Got that?