Let’s throw some Iranian nukes in the mix and see what happens.

It would like nothing better than to trigger a fully blown sectarian war between Sunni and Shia in Saudi Arabia, which is home to the two holiest sites in Islam, in Mecca and Medina.

IS likes to present itself to Sunnis as being the sole force in the region capable enough and willing to push back against the creeping advance of Iran’s Shia allies.

As part of that narrative it would like to pull in more of the mainstream Sunni population behind its banners to resist what it sees as a heretical Persian-inspired apostate creed.